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Biology question?

My neighbour cut down a tree last year, down to the ground. This year it sprouted shoots again from the cut edge. My question is by what mechanism did the remains of the tree "know" 1. It had been cut off and should produce new shoots if it wanted to survive, 2. When to start producing these shoots. i realise it is triggered by day length and temperature rising BUT how does the tree measure these things?

Question by rickharris    |  last reply

biology maximum cell size

What stops a cell from being extremly large? inparticular in prokaryotic cells, like algae, where it is the cell and is not part of something bigger like a tissue or organ. also in the way of darwins theroy of evolution, does any one know how much it appiles to algae, either all or some strains and how much they addapt and how quickly?

Topic by thelastonekills    |  last reply

A weird question about man anatomy ... (don't open if you don't like man anatomy !)

I was just wondering how it comes that our testicles don't make knots into our scrotum ... Because, technically, if I put two balls attached to two strings in a same pocket, I should end up with knots ???Any clue ?=o]

Topic by chooseausername    |  last reply

Is it possible to store a living human/animal for years at a very low temperature and recover him back alive? Answered

They do it with plants, and it has been successful in some cases. They do it with animal limbs, so is it possible to do that with a whole human and recover him back alive after years, to find that he/she hasn't aged? 

Question by ankur2893    |  last reply

Decontamination advice for a found Carboy? Answered

I have a nice 5 gallon glass bottle with a screw on lid ( I think they are called a carboy ) which I would like to make into a terrarium or maybe an aquarium. The problem is it formerly contained chloroform. I didn't use the chloroform, I just found the carboy/bottle. How would I go about making it safe to use. I was thinking activated carbon slurry, but thought I would ask here for best advice.

Question by underwhelmed    |  last reply

Do It Yourself Genetic Engineering

From New ScientistKATHERINE AULL's laboratory in Cambridge, Massachusetts, lacks a few mod cons. "Down here I have a thermocycler I bought on eBay for 59 bucks," she says, pulling out a large, box-shaped device she uses to copy short strands of DNA. "The rest is just home brew," she adds, pointing to a centrifuge made out of a power drill and plastic food container, and a styrofoam incubator warmed with a heating pad normally used in terrariums.In fact, Aull's lab is a closet less than 1 square metre in size in the shared apartment she lives in. Yet amid the piles of clothes she recently concocted vials of an entirely new genetically modified organism....Read the whole article in New Scientist

Topic by kelseymh    |  last reply

On a Microscope; Double Layer Mechanical Stage vs. a Mechanical Stage? Do both move on x & y axis? Answered

We are going to purchase a microscope on-line, I'm having a hard time deciding on the more expensive one w/ Double Layer Mechanical Stage, or the less expensive one with just plain Mechanical Stage in the description. They both look the same to me. They are both nice microsopes, binocular 40-2000x magnification, condeser lenses, iris diaphrams, the whole 9 yards. I dont want to have difficulty looking around in the objective feild for things like erythrocytes, monocytes, and the like, and I don't know what the double layer thing means. Any "Seasoned Pros" out there to give me some advise?  The Pics below are of the 2 choices. The left is the Double Layered Mechanical Stage, the 2 on the right are of the plain Mechanical Stage.

Question by Joe Smania    |  last reply

Small battery powered heating element for Biology experiment?

Hello everyone! I would like some help designing a small heating element. It will be battery powered (and voltage hopefully 3 or 4 C or D batteries). It should fit on the top of a quart mason jar, as I will be heating the milk inside to about 90 degrees Fahrenheit for a period of one week. I would hope that battery changing is not necessary, but if so, any help is wanted. I have soldering skills, and would prefer to make as much as possible by hand. I also have lots of spare parts and wires, as my dad is an HVAC Chiller Mechanic. A coil of wire attached to batteries slid through holes in the lid might work?

Question by EdmondD3    |  last reply

science Question!

While day dreaming in history class, A question popped into my mind; If our body temperature is 98 degrees Fahrenheit (37 degrees Celsius) why are we uncomfortable in hot weather?

Topic by mynameisjonas    |  last reply

I'm a TA for an Intro to Biology course. Are there any small scale, simple experiments I could do to get them excited?

I'm a TA for an Intro to Biology course. I always make Oobleck to get them excited on the first day. Are there any other small scale, simple experiments I could do to get them excited? Thanks!

Question    |  last reply

Live mice grown from stem cells (iPS)

According to a news article on Nature's Web site, two different research groups have grown live mouse clones using "induced pluripotent stem cells" (iPS). These are initially normal adult cells which are treated such that they revert to the same state as embryonic cells.

Topic by kelseymh    |  last reply

Bio-technology (reactors)

I have a DIY perfusion bioreactor,when linked to a modifed haemodyalsis machine via myself, it allows for long term storage (in theory) of anything up to pretty much a human fetus or brain (provided the DNA matches so as to avoid my body attacking whatever lies within the reactor), this has been tested on various DNA and cell structures twice, I have no intention of trying again as dialysis even when done by experienced highly skilled professionals will inevitably over time lead to death, on top of that the amount of pain involved makes conducting experiments very difficult. Has anyone any experience in the more standard system of blood bags PC controlled to feed the environment as I am a little out my depth, I am looking for less dangerous and painfull solutions.

Question by RandomNOOBy  

How can I obtain cheap geosmin-scented air freshener?

What's the cheapest (safe and legal) way to obtain a small quantity of relatively pure geosmin? By "small" I mean an amount sufficient to keep a room smelling like rich earth for weeks. By "relatively pure" I mean it won't turn funky or give someone a nasty case of fungal pneumonia. Brew it? I know dehydration and alkali could -help- isolate Streptomyces, but then what? I don't have access to ready-made selective media nor money to buy strange supplies.

Question    |  last reply

How can you somehow create a way to electronically count the number of bats going in and out of a bat house?

For my Advanced Biology class at school I am thinking about starting a bat project. I have a way to measure the temperature and humidity of the inside of the bat boxes, but would really like some sort of sensor to count how many bats are in there...and manually isn't going to work so well. Any suggestions? Any other bat-related ideas? (Other than selling bat guano...already been suggested) thanks

Question by shortone    |  last reply

Need ideas for basic science! Answered

Hey guys. I'm in my final year of school before we all part ways and go to university, and a small group of us had an idea to do an outreach program to local primary schools- British equivalent of Elementary School with grade 7. As part of the program we are aiming to interest these kids in learning sciences and engineering since we could be doing with more people taking these subjects in the academy. So can you guys offer any suggestions as to what we can demonstrate and what activities we can get the kids involved in? We have a few ideas for biology, chemistry and physics but not so many for engineering... Just a little side note, I'm not sure how American schools operate but in Britain we have EXTENSIVE (annoying) health and safety crap and risk assessments if a pupil coughs, so nothing too... Explosive Thanks, Tom

Question by thomas9666    |  last reply

Biophysics: Airspeed of an unladen colugo...?

I'm looking for hard data on the relationship between typical airspeed / stall speed, glide angle, and wing loading of large gliding/flying mammals like the colugo, japanese giant flying squirrel, and flying foxes.  At first glance, Google turns up these facts with minimal digging. The catch is that the data are provided for different individuals, which is almost useless for my purposes.  Could someone point me toward a source that has all three pieces of information for the same individual, and preferably lists them for several individuals? Better still, is there an existing paper comparing the relationship between these numbers across unrelated species?

Question by passersby    |  last reply

Anyone tried a (true) UV LED based moth trap?

I have also commented on a seemingly related old dead thread but hope for better luck here. Firstly, did anyone ever make any progress with building and successfully using an LED based moth lure/trap? Secondly and if yes, any advice? I am currently in the process of building a lure/trap that will use reflected wavelengths (interchangeable LED head) based on the principle that Moths (as pollinators) and flowers (as pollinatees) see and reflect UV light respectively and if that is true then surely i can take advantage of this to build a targeted trap to trick the moths in. note i will be testing UV wavelength (365nm), violet (400nm) IR and white LEDs.

Question by BDen    |  last reply

I am 15 and i want to get into MIT.I live in Bangladesh(Asia). Answered

Um hey i am really sorry to bother you people but i am really desperate :P   I am 15 years old and i live in Bangladesh (Asia). Currently i am doing my GCE O'Levels from British council Edexcel. I gave three exams in this january: Chemistry,Biology and human biology. In this may i will give Maths B,Pure maths,English and a language which is bengali (my native language) and physics in january 2010 with some of GCE A'Level subjects. I want to be a pharmacist from MIT. I love biology and chemistry but not so fond of physics so, do i need to keep physics in my A'Level? (A'Level is the college form and O'Level is the high school form or GCSE,sorry can't explain properly :( ) From next month i am planning to start my A'Levels: BIology and chemistry AS. I am planning to keep biology,chemistry and maths in my A'Levels. Will you please give me some advice on what i should take and if i really need to keep physics and some preparation for MIT like if i need to do anything else (i know about the SAT and few more things but not sure) Please help. Thank you very much i really appreciate your help.  

Question by bushra    |  last reply

I'm having a hard time finding a recycling project for my college biology class that turns trash into something useful

 Most of the project ideas that I've seen so far seem too basic, too simple, and not creative enough for a college level project ( e.g. a milk carton bird feeder, green house is a bottle...) Any ideas on a project that will show a high level of difficulty, creativity, and usefulness of a material that might otherwise cause harm to the environment if not recycled? Thanks for any help...

Question by LillahS    |  last reply

Vampires versus Zombies. Which affliction reigns supreme?

Assume for a moment that both vampire's and zombies exist, and also that zombie's disease is a blood borne one. If the vampire decides to feed and jumps a zombie does the zombie become vampireish or does the vampire, draining the zombies blood, become infected.Or does the zombie just die and the vampire ends up with indigestion?

Question by Etchesketch    |  last reply

Why isn't removing blood from your bloodstream a good way to reduce high blood pressure? Answered

We were discussing about blood and blood pressure in Biology one day, and I asked my biology teacher this question.  She said that the blood pressure would shoot back up again, but didn't really elaborate. Can someone here explain why this isn't a good fix for High blood pressure?

Question by DJ Radio    |  last reply


I'm always interested when art and science collide. In this case it's a biology! Designer and materiologist Marin Sawa has come up with some stunning designs using algae as the central theme. Beautiful and interesting!  Check out the full article on Cool Hunting

Topic by Culturespy  

project for a human skull replica need to make a skull and i need idea how to make one does any body have an idea Answered

I need to make a replica of a skull  for biology can anyone maybe help me with an idea or an instructable need to give it in at the 30th of august

Question by tokol    |  last reply

Can someone help me with classifying/identifying this plant? Answered

I have no idea what type of plant it is, but need to find out.  If someone has any idea, could you please forward information or possible answers.  This plant is for a biology experiment and I have attached a picture below.  I know it is a tropical plant, but that is about it.

Question by Hunter4000695    |  last reply

Organize favorites

I'd love the ability to organize my favorites into categories that I choose.  I'm a science teacher and use instructables for various lesson ideas.  Some are for physics classes, biology classes, chemistry classes, just for fun, etc. This would make finding my favorited instructables easier to find and also convenient for sharing groups of instructables with my students.

Topic by matt.nupen    |  last reply

How can I turn algae into some sort of a biofuel?

I saw the instructable on the algae bio reactor. I then decided to use that as my Marine Biology final project but I also wanted to one up the instructable and put in my thesis that I would turn the algae into a bio fuel. How can I make this possible. Please help my grade depends on this.

Question    |  last reply

DIY autoclave? Ideas?

Does anyone know of a way to build an autoclave? I know that they are essentially pressure cookers on steroids, but would a standard pressure cooker truly sterilize something? No, I'm not trying to give myself tattoos or attempt surgery on the cat. It would be mostly for biology experiments, such as swabbing cultures. I could get one on eBay for about $150 minimum, but I don't really feel like spending $150 to grow bacteria. Any ideas?

Topic by CameronSS    |  last reply

Modernist Cuisine: WANT!

Modernist Cuisine is finally going to be published on March 14! As a molecular biology major, chemistry minor, and general molecular gastronomy food geek, this is just about the coolest food book ever.  Of course it's pretty expensive ($625 list, $467 on Amazon), but compare this to the price of five high-level science or engineering textbooks.  It's in the same ballpark. I'd love to get my hands on this just for the excuse to break out the chemistry equipment! Check out the blog for recipes. 

Topic by canida    |  last reply

Find out (exactly) where your steak comes from

My friend just forwarded me a link to the Bovine Myology and Muscle Profiling website. It's got a pretty impressive 3D visualizer for all the different layers of the cow flesh, an incredibly thorough how-to style video library useful for breaking down a cow, and is simply neat for anyone interested in biology, animals, or just plain weird stuff like this. via benjaneer

Topic by noahw    |  last reply

Introduce Yourself

Hey everyone! Welcome to the group & thanks for joining! Take this opportunity to introduce yourselves, what grade you're in, what classes you take, school stuff, whatever else you want, etc. I'm Mark. I'm currently in 9th grade. I went to a Catholic boys' school for the first semester this year, but starting Monday, I'll be going to the public school closer to home. For the first semester, I took Biology Honors, Geometry Honors, World Lit Honors, World History Honors, Technology, and Spanish I. My favorite class this year BY FAR was Geometry.

Topic by Labot2001    |  last reply

Does anybody know of a website for learning how to create remote controlled machines?

I am a part of science olympiad at my school and we are trying to enter into the remote control arm competition. The point of science olympiad is to help students learn about different science fields. Well, the problem is that the only person who knew about remote control machines and electronics had to leave due to personal issues and the sponsoring teacher does not know about electronics, only chemistry and biology. I searched superficially through the internet and I could only find advanced remote control machines and not how to work about the basics such as a simple switch control. I was wondering if anyone knew of more descriptive websites or tutorials for remote control design?

Question by killer1474    |  last reply

Want to feel *really* small and insignificant?

Maybe you have heard of the "Tree of Life"? It's an old idea, with the first version being sketched by Darwin. There's a new (ish) one out.  I saw rough copies last year, but the reference pages of Dawkin's latest book led me to this web page. The image of the Tree there is, officially, "simplified", but still contains 3000 species, so it has a convenient "you are here" marker (second image, plus PDF file). Apparently, to see it properly, you have to print it out at a size of four and a half feet or more... The tattoo is on the back of Clare D'Alberto, who is working on her Ph.D. in biology at the University of Melbourne, but I'd love to see what the Makers here could do with the original image?

Topic by Kiteman    |  last reply

Lab Equipments

Look at the video attached. Those of you working in biology/chemistry  research labs may be familiar with these. One of them is a rotator (with small tubes fixed in the clips) and the other one is an orbital shaker (well, technically they're both sold as rotators). Can anyone please help me with building either or both of these. I have never done a DIY project before and would love to start with these. It doesn't have to be exact same design. It could be something very simple but functionally similar. It should be able to run for extended periods without overheating (24-48 hours). Also, I would prefer something that can run in a cold room (4 degree Celsius) but I can use anything right now. Much thanks in advance!

Topic by mranjan2    |  last reply

The Blood-Mobile - a random YouTube video.

I found this site: And I only got to 4 reloads before finding this. No, it's not a refrigerated van, it's not a mechanical-vampire either; it's human-biology. An all in-one-vague "this how things work kids, but the most important part of your body is all the "traffic". (No mention of traffic-congestion, but that's probably a different film) I don't know what deranged person thought of the idea, but I guess they laughed like I did. (Ten more and I was finding a 1 tonne bulk-bag of grass that had previously passed through the digestive-system of a male bovine) Man, surely people would press the button? L

Topic by lemonie    |  last reply

Is this ambergris

Hi,My dog bought this item to me whilst walking along Duranbah Beach in Queensland Australia.It floats on water, weighs 323 grams, has a nice sweet smell. Ambergris buying experts in France say "definitely not ambergris".Passes all the tests for ambergris including hot needle.James Cook University, 5 marine biology experts came back to say "not certain from photos but most suggested ambergris"One image on ambergris New Zealand buyers website looks almost identical to this piece.I really would like to know what it is, if anyone can help with guidance or perhaps seen similar.Look forward to feedback.Thanks in advance.Best RegardsBrendan WarlowSheldon, Brisbane, Queensland, Australia.

Topic by BrendanWarlow    |  last reply

any electronics or robotics project

I'm getting bored these days so I want to try something new. I saw the winner with the intructable about the motorcycle signals sewn on her jacket, or something. I was inspired at how creative that idea was and since I'm not doing much nowadays, I want to make a project about electronics or robotics. The truth is, I have no experience in this topic, that's why I said something new. So, any of you who got any ideas about these topics and if you're really that generous, provide me an instructable on how to do it. I really want to prove myself that I can also do something in this field, not only in Biology. Well, that's all. I'll appreciate anything that you'll suggest. Thank you very much.

Topic by l.arvinpascua    |  last reply

How many times have you changed your major?

Or, if you're out of school, how many times did you change it during school? At first, I thought maybe I'll do biology. Then it was CIS. Then I thought hmmm... English. Then Psychology. I've finally ended up in the Health field and I love it. I was going to do Public Education... but it seems quite unattainable now and I'm feeling a bit overwhelmed. I don't think it's something I can do while working full time. Plus... I'm really not getting along with my epidemiology classes. So now I'm leaning towards being a physical education teacher or a personal trainer. (Exercise science.) And yet I would still rather spend my time building things. :P

Topic by jessyratfink    |  last reply

any electronics or robotics project

I'm getting bored these days so I want to try something new. I saw the winner with the intructable about the motorcycle signals sewn on her jacket, or something. I was inspired at how creative that idea was and since I'm not doing much nowadays, I want to make a project about electronics or robotics. The truth is, I have no experience in this topic, that's why I said something new. So, any of you who got any ideas about these topics and if you're really that generous, provide me an instructable on how to do it. I really want to prove myself that I can also do something in this field, not only in Biology. Well, that's all. I'll appreciate anything that you'll suggest. Thank you very much.

Topic by l.arvinpascua    |  last reply

Things a plant would say...

I'm working on something fun...  We'll leave it at that for now. I need a nice, long list of things a plant would say to a human.  Humor and biology geekiness are welcome!  Patches to folks who come up with the most phrases or the best phrases.  Keep it PG though, ok? Here are some examples: "I think you should become a meatatarian" "So when are you going to evolve and run on sunshine, like I do?" "Gahhh!  Aphids!  Get 'em off!  Get 'em off!" "I'm thirsty.  Water Me!" "Audrey II is my hero." "No worries, baby - I'm organic!" "When you belch it's like a breath of fresh air." "My pistol is useless against insects!" "If you kill me, I think you should try a rock garden next."

Topic by jeff-o    |  last reply

tips on buying a microscope, looking for aa good used deal. ecoli, parasitesl, arva eggs,

I want to buy a compound microscope, i want to be able to check for ecoli and parasite eggs. i figure 2000 power may work, correct me if not. would really like to be able to monitor or take pics via pc, but may be out of  price range.  looking at $300 us tops ,unless a super good used deal for around $500 comes by. i never took biology ,well since high school, so am out of ouch of what i want. ebay has new ones of a chinese brand, have to look up the name, but prefer used for better deal unless people know that the new ebay scopes A??? are a good deal. are scopes up-gradable , meaning, could i get a scope and add the camera attachment later? thanks, pure noob here, i know i dony want clips, and i know certain lights = cheaper from my research.

Topic by escapefromyonkers    |  last reply

Age of Aquariums Special Guest Judge Announced!

For the Age of Aquariums Contest we are bringing in a special expert judge, Alex Andon! Alex studied marine biology at Duke and was always fascinated by the jellyfish exhibits at public aquariums. Jellyfish can't go in a regular fish tank because they would get sucked into the filtration system. They require a kreisel tank with a special water flow pattern to keep them suspended in the middle of the tank. There were no commercially available jellyfish tanks, so Alex started experimenting with large tanks and then made them smaller and more affordable until he had designed the first desktop jellyfish tank. He launched it on Kickstarter and raised $163,000, making it one of the first successful crowdfunded launches of a product. The company sells specialized jellyfish aquariums and breeds its own jellyfish, shipping them overnight to customers throughout the U.S. Alex's latest project is the Chargerito, the world's smallest in-wall phone charger.

Topic by Danger is my middle name  

Call for Makers for Maker Faire

Entries are now being accepted for the bay area Maker Faire that will be happening on May 3-4 in San Mateo. This is an awesome event and we'll be there to represent, but we'd love to see some of you guys show off your cool ideas as well. You have until March 12 for entries. If you want to show off what you can bring in person, there are tryouts on Feb. 17 at the Exploratorium.Here are a few suggested topics: - Things Made From Recycled Items - Making Musical Instruments - 3D Printers and CNC Milling - Textile Arts - Home Automation - Rockets - Ham Radio - Puzzles, Games and Toys - Cars (hot rods, custom vans, electric vehicles) - Airplanes and Aeronautics (models, etc) - Biology/Biotech - Chemistry - Food Makers - Model Trains and Planes - Green Tech - Sewing and Felting - Kites - Old Farm or Garden Equipment (Tractors, etc.) - Temporary Structures (Tents, Domes, etc.) - Unusual Tools or Machines - How to Fix Things or Take them Apart (Vacuums, Clocks, Washing Machines, etc.) Call for Makers

Topic by fungus amungus    |  last reply

$99 genetic testing, one day only!

This is cool:  23andme is having a one-day sale on their Complete Edition kits in honor of "DNA Day" for $99, or 80% off the standard price of $499.   The price is ONLY good on April 23, 2010. $99 to spit and a tube and get info on 148 diseases adn conditions, plus some info on your ancestors' migration patterns?  This is the next best thing to DIY genetics - totally sweet!  A bunch of us at Instructables have already signed up*. What do you think about the idea of genetic testing:  awesome, scary, or somewhere in between?  Are you interested in getting tested?  How much is this kind of informatino worth, and would you try it if it were free?  Are there things about your genes you wouldn't want to know, or is more information always good? *I find this sort of thing fascinating, and not just because my undergrad degree is in biology - for me it's about knowing everything I can about my body and how it works.  The more information I have, the more I can modify my behavior, and generally tinker around under the hood - it's an extension of the "if you can't open it, you don't own it" DIY ethos. 

Topic by canida    |  last reply

Group : Collection of Instructables for class-room and teaching purposes ...

Hi !I created a group that seems not to have been ever created here yet."Class-Room" group.The main purpose of this group is to make a collection of every instructables that may be useful for school teaching, and that may be reproduced by pupils or students as science-fair or class-room projects ...Please, add your Instructables if they fit this description._Biology :"Be a Scientist : map your skin"Chemistry :"Carbonating""Kitchen laboratory II : The CO2 trap""Make crystal clear ice !""Make Rheopectic slime in less than 15 minutes !""Shelling a raw egg !""Sodium Acetate"Investigations :"Amazing Kite For Under $5""How to make Playdough (Play-doh)""Oobleck""Pop-Up 3D words and messages !""The Huffin' Hoopster""The Improved CD Hovercraft."Physics : Electricity & Electrostatics :"Build an Electrostatics Motor""Jacob's Ladder Sculpture from found materials""Kelvin's Thunderstorm : Create lightning from water""Paper Resistor"Physics : Instruments & Measures :"Be a Scientist : Make your own force-meter.""Be a Scientist : Make your own thermometer"Physics : Magnetism :"A simple mechanical resonance demonstrator""Diamagnetic Levitation Experiment"Physics : Optics :"Naff Movie into _DVD-Spectra_""Optical Water-Prism"Physics : Sound :"How to measure the speed of sound ...""Mechanica Wave Driver for Chladni Plate"

Topic by chooseausername    |  last reply

Chemcial Question for Taxidermy Related Project

I am quite interested in the articulation of the bones of animals. I plan on using small game (squirrels, frogs) to begin with, and I will probably donate them to my Biology teacher, since she loves skeletons.The process of defleshing and whitening the bones of the animal is fairly straight forward - soak the carcass/skeleton in chemical baths and take it out when it's done. The chemicals needed for the process are what's going to be hard for me to obtain.I need a 0.3% solution of sodium carbonate. Sodium bicarb is extremely easy to come by, but I've never seen sodium carbonate. I've heard it is used to raise the pH in pools, so I'm guessing a pool store would carry it. But, would it be possible (practical) to make it? Is there a way, using household chemicals, to produce sodium carbonate? I don't need very much.Secondly, I need a 20% solution of hydrogen peroxide. I only have a 3% bottle. I've heard H2O2 is some pretty dangerous stuff. Again, is it possible for me to buy/make it? Would freeze-purifying it work?Thanks for any help, and if I get this to work out, of course it'll all be turned into an Instructable.

Topic by Bran    |  last reply

See What's Really Happening in Physics --

If you are curious about what "real physicists" do, or what the current "hot topics" in research are, take a scan through the "recent postings" at the Physics Preprint Archive. Started for the High Energy Physics community in 1991 at Los Alamos National Lab under the name, and with a purely e-mail interface(!), arXiv moved to Cornell Univerisity with its creator in 2001.The archive includes preprints from all areas of physics research, not just HEP, as well as computer science, mathematics, and quantitative biology. "Preprints" are a way for the research community to get their results out for everyone to read, during the often lengthy period (months, sometimes!) between submission to a journal and actual publication. In many fields, it has been traditional for decades that printed copies of "preprints" were mailed out, sometimes in regular batches, between major University departments. That mechanism has been superseded almost exclusively by the arXiv database.Besides these traditional pre-publication journal articles, the archive also often includes conference proceedings, and submission of much older published papers of general interest to the community. There's also (usually in the general "physics" category) a scattering of crackpot nontraditional science papers.

Topic by kelseymh    |  last reply

Tool-use observed in molluscs!

Everybody knows that humans are "special", somehow different from the other animals on our little blue planet, but it is very difficult to define just how. An early casualty in defining "special" was tool-use.  First chimpanzees, then primates, even birds were observed using tools - hammers, anvils, probing tools, fishing rods, weapons. Now a mollusc is being presented as a tool-user. The veined octopus Amphioctopus marginatus has been filmed by divers collecting coconut shell halves (actually human litter, dumped in the sea) and carrying them away to use later as a shelter. Their habitat is open, featureless sediment, no protection from predators.  The shells provide vital shelter in the exposed underwater plain. If the octopus finds a single half-shell, it digs it up, carries away and then turns it over when needed. If the clever creature is lucky enough to find two halves, it stacks on inside the other, then later "rebuilds" a whole coconut, except this time with a yummy octopus filling. This is another example of high-level intelligence in these bizarre animals.  To me, octopus are a prime candidate for the next "special" animals on Earth, once those polluting apes are out of the scene... Museum Victoria article by original researchers, with video online. Full story from Current Biology, with downloadable videos. BBC story with video online.

Topic by Kiteman    |  last reply

Found a REAL Sea Turtle in a Dumpster?

I was at the beach a few days ago for a school field trip/ biology class. I'm always searching for material for projects, so I figured that while I was waiting for others, I would take a look, as something that looked like a motor caught my eye. It was just a rusty motor, but on the way back, while walking near a dumpster, I spotted something HUGE inside.  A REAL SEA TURTLE IN A DUMPSTER? I didn't know if it was real, but: There was no smell - no flies and bugs too. It's either a fake turtle, or has died recently.  The shell was peeling. The shell of a tortoise is in one piece, but the shell of a turtle is different? The head looks like it has been connected to the shell. I don't think that means it's a real one. The rear left leg looks just so real. If it's actually real, I would think that someone spotted it, dead, on the beach, and called the people that deal with that stuff. I think that it's pretty unlikely that the turtle fell in, as it would have probably landed upsidedown, and because it's pretty far from the swash (?) zone, even though I know that can travel way more than that, probably even uphill. Pictures below. What do you think? ᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴬᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴᴴ

Topic by Yonatan24    |  last reply

Graphical User Interface Library for Physical Computing in Processing

Visit our blog: The subject of physical computing, especially in the field of robotics, is a fascinating area that has already begun its triumphant in universities, schools and hobby applications and is developing with impressive speed. It is highly interesting that Pyhsical Computing and Robotics, more than any other area, can merge many different areas (engineering, design, psychology, biology and many other areas). Our target groups are mainly users with robotic and physical computing affinity: engineering, programmers, mechatronics engineers, product designers, interaction designers, communication designers, robotics, interface designers, developers, electronic engineers and artists. There are people who want to monitor and control the input and output of their system without major effort in which they rely on an interface library. Robot experiment sets are increasingly being used in short-term projects in schools and universities to provide basic knowledge on physical computing. Our analysis of current sets shows us that existing features don’t cover all aspects of robotics. The aspect that has been neglected so far according to our research, is the controlling and monitoring of experimental physical computing projects through a graphical interface. Visit our blog:

Topic by faydemir  

A Level choices

 I'm not after anything in particular here just want some opinions. After recently applying to my local sixth form college I'm curious as to...well I just want to talk really. My options are: 1.Chemistry 2.Physics 3.Mathematics 4.DT: Product design - Materials Reserve:Computing GCSE: P= predicted grade, C = current grade (Or already gained GCSE), L/10 = how much I enjoy, G/10 = how capable I am. Maths: P= A*, C=V. high A, L8/10, G7/10 Physics: P=A*, C=A*, L9/10, G9/10 ICT: P=D(distinction), C=D, L7/10, G10/10 BPE: P=A*, C=A/A*, L6/10, G8/10 Chemistry: P=A*, C=A*, L9/10, G9/10 DT (Electronics):P=A*, C=A*, L9/10, G9/10 Catering: P=A*, C=A, L5/10, G8/10 Music: P=A/A* , C=B/A, L5/10, G7/10 Biology: P=A/A*, C=A/A*, L8/10, G7/10 English Lit.: P=A*, C=A, L6/10, G6/10 English Lang.: P=A/A*, C= B/A, L6/10, G6/10 PE: No GCSE Anyone else recently applied for sixth form? Currently at sixth form college or university? Any advice? I reckon I am going to end up (sounds so negative) in Engineering or Science, whether I choose University or an apprenticeship etc. ANY advice appreciated.

Topic by DELETED_zoltzerino