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Onshape.com is free for the first 100 MB and has an open-source code for Feature Script commands, one of which generates involute gears. I made a gear set to run my son's Tonka with an automotive window crank motor.
Getting Started with Glue
How To Make Your Own Sugru Substitute
Baking powder = Baking soda + cream of tartar (a biproduct of winemaking that makes biscuits delicious)
You're just separating the fly specks from the black pepper with this comment.
Most of us had high school chemistry, but forgot plenty. Adding salt will not increase the [H+] ion content (the pH level) of the mixture. How can it be "harsher" if it is no more acidic? In the case of either acid, it's only the hydrogen ions that participate in any reaction. Salt is also known as dehydrated ocean water: just add water (or DHMO). Vinegar is a 5% solution of acetic acid and water. Acetic acid is very similar to ethanol, both of which are already in everything but perfectly distilled water. These chemicals in nearly any quantity are less harmful to the environment than a package of HoHos (ink, plastic, and hardware store products used as fillers and preservatives).
High Tech - Low Buck Digital Torque Meter
DPScope - Build Your Own USB/PC-Based Oscilloscope
The Only knot you need to know.
Hidden Garage door opener (UPDATED)
Creating your First Multi-touch Table