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  • hydranix commented on amalkhan's instructable How to Distill Water16 hours ago
    How to Distill Water

    Flourine is very important for our teeth. We have a layer of stuff protecting our teeth and it's called apatite. This stuff is easily dissolved by acids, like in carbonated drinks and in a lot of candy and other things we indulge in too often.Flouride ions bind with the apatite on the surface of our teeth and create Fluorapatite.Fluorapatite is much more resistant to acids, and also naturally kills bacteria it comes into contact with.This is exactly what allows us to keep our teeth beyond our 20s or 30s (which they were evolutionarily never intended to last beyond).If fluoridating water actually showed links to health problems, and the science was real and reproducible, then there would be no reason to continue adding it. Conspiracy theories aside...

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  • Make an Ultra Simple High Voltage Generator

    use he pwm signal to drive a transistor to pulse the battery

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  • Ultimate Guide to Making a Cheap but Effective Aluminium Forge.

    I took the top of a fire extuingsjer that I thought would be the perfect crucible. Fire extinguishers are often made from aluminum. They can do this since the pressure is very low, the gas used is safe, and the content is (obviously) non-flammable.Propane is under much more pressure than the extinguisher, and being flammable even explosive has certain legal requirements, one of which I imagine is requiring either very thick aluminum (not economic) or using a stronger metal like steel.

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  • hydranix commented on MaxPower1977's instructable How to Build a Propane Forge Burner2 months ago
    How to Build a Propane Forge Burner

    Will this produce enough heat to melt asphalt concrete (pavement/tarmac). Yes it will melt the asphalt cement in the concrete.How smooth it becomes is entirely dependent on the aggregates in the concrete. Heating it may even make it less smooth as the warm cement loosens and sinks deeper between the aggregates.You'll likely have to roll the hot concrete to smooth it out, the roller size also depends on a lot of things. Anywhere from 300lb to 3ton roller could be required.

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  • hydranix commented on barri_kid's instructable Radio Jammer2 months ago
    Radio Jammer

    Hi jotclot, I was wondering if the whispers were still bothering you, or if you perhaps had seen a doctor for their opinion yet?Don't let the other posters calling you crazy get to you, you're not. Unfortunately though, if you don't see a doctor about it, the whispers could eventually drive you crazy.I hope all is well with you.-

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  • hydranix commented on Sonam Sawant's instructable turn webcam to IR sensitive camera6 months ago
    turn webcam to IR sensitive camera

    In case anyone was wondering, this is not a night vision camera (as some comments suggested). The cheapest way to get a night vision camera is to just emit a very bright flood of infrared light in front of the camera. Human eyes cannot see infrared light, but cheap webcams can. Get a handful of high power IR LEDs and point them in front of a normal web camera with no modification.This instructable is not trying to make a night vision camera. It's modifying the webcam to filter out most of the visible light spectrum but intentionally not filtering out the infrared light. Infrared light occurs at a lower (electromagnetic) frequency than visible light, and lower frequencies tend to penetrate better than higher frequencies. But that's only partially true. Since almost all humans are very fa...see more »In case anyone was wondering, this is not a night vision camera (as some comments suggested). The cheapest way to get a night vision camera is to just emit a very bright flood of infrared light in front of the camera. Human eyes cannot see infrared light, but cheap webcams can. Get a handful of high power IR LEDs and point them in front of a normal web camera with no modification.This instructable is not trying to make a night vision camera. It's modifying the webcam to filter out most of the visible light spectrum but intentionally not filtering out the infrared light. Infrared light occurs at a lower (electromagnetic) frequency than visible light, and lower frequencies tend to penetrate better than higher frequencies. But that's only partially true. Since almost all humans are very familiar with the penetration properties of visible light (as we experience it all day long), the properties of non-visible light can be surprising. Infrared light penetrates flesh fairly well, but gets absorbed by blood almost completely. So you can see the veins within thin parts of the body (like hands). Ultraviolet (UV-B) light is a higher frequency than visible light (and UV-A), and just barely penetrates the skin, and is completely absorbed just below the surface along with all the energy of the photon which "carries" the light, which is why it gives you cancer.Woah i got carried away...

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