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These classic siege weapons from the middle ages also happen to be great tools for teaching physics
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Mega Cyborg Hand CAT_Brainteasers These classic siege weapons fromBuild your own BIG hydraulic hand, slip your hand into it like a glove, and operate the mechanical fingers with your own fingers. Assemble the cyborg hand using over 200 plastic pieces, fill the piston tubes with water, and adjust it to fit your own hand. The hydraulic pistons enable the fingers to open and close, and to grip objects with enough force to lift them. The hand can be configured in three ways by changing the position of the thumb: left