This tutorial will give you all the sources I know of for household chemicals in the United States. This excludes chemical suppliers and ebay. A good majority of these household items are impure sources of chemicals, so in order to obtain just the desired...

Learn how to build a magnetic stirrer from an old computer for use in the home laboratory. It'll cost you almost nothing!

Learn how to build a ball mill for grinding solids into fine powders. Commercial ball mills can cost more than $100, but with this tutorial you'll be able to make one that works just as well for no more than $30!

So you got a new digital or 35mm camera. Congratulations! Now all that's left before you go out to take some outstanding pictures is to try and figure out what all those numbers on your camera mean. The instruction book that came with your camera is good...