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Get flash to fully experience Pearltrees
http://www.thinkgeek.com/geektoys/science/91e4/

Hydrodynamic Building Set

Water is everywhere.
Background I remember back when I had an ant farm as a kid and it used to be one heck of toy. http://www.instructables.com/id/Luxury-Ant-Farm%3a-The-mANTsion/

Luxury Ant Farm: The mANTsion

Okay, the first thing you will want to do is gather all of the necessary parts. They include 1 pencil with ereaser, two dried out old click pen parts, a piece of 8in. long PVC pipe, 1 dead light bulb, 1ft long piece of 2 by 4, a elastic band, one metal paper clip, aluminum foil, see through tape, one small toy motor, 9 volt battery, and some junk wire.

Van de Graaff Generator made from junk

http://www.instructables.com/id/Van-de-Graaff-Generator-made-from-junk/