Perfect science fair project!! Enough material to grow 3 trees
Crystal Growing Tree
Instructions with 17 scientific questions and answers
For Ages 5+
A great introduction to expansion and contraction!
It consists of a funnel tube and a stopcock tube connected together by a piece of flexible tubing wh...
Assemble your own DC motor and learn by doing!
Knife Switch with Screw Type Binding Posts - Single Pole, Single Throw