NIST Chemistry Webbook – NIST’s database of chemical information.

NIST Online Databases – Free Standard Reference Databases

International Safety Chemical Cards – chemical safety database

Chemical Compatibilty –  check to see if your chemical is compatible with its container.

Safety Glove Chemical Compatibility – check to see if you’re using the right gloves.

 $10 robot – can’t afford a Lego Mindstorm robot kit?  This website includes how-to instructions on building a robot for $10 courtesy of the African Robotics Network.