Mega Cyborg Hand CAT_Brainteasers this tractor features a front

this tractor features a front blade that can be angled to the left or right and raised up and down to move dirt or sand

use the crayon rubbing tool to make you design apear on the paper

and only Penny

These classic siege weapons from the middle ages also happen to be great tools for teaching physics

You have a hand of cards

Mega Cyborg Hand CAT_Brainteasers this tractor features a frontBuild 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