models and model making

"Omar and his friends investigate sabotage at the model rocket-building contest they are competing in"--.

Offers instructions for creating over fifty models using just one hundred and one common LEGO bricks, including robots, spacecraft, household objects, goofy faces, and vehicles.

Guide to making woodworking projects that move, whiz and whir, flip, and more.

Instructions for using readily available materials to make models of machines such as pulleys, windlasses, and water wheels, with suggested experiments to demonstrate their capabilities.