$20 to $50

This hop-around-the-room game will have you and your toddler learning, laughing, and moving together! Players turn over cards and perform actions s...

Welcome to the fascinating world of mechanical engineering! Make 8 motorized robots that move in different ways while exploring how each one uses g...

62 LEGO elements including axles, kinetics, and cranks, in this part craft/part builder set! Build 8 physics-driven bot creatures, using LEGO Techn...

Build your own mechanical hand, slip it on like a glove, and get a grip, without motors or electricity. It uses hydraulic power to simulate the mov...

Google "orrery" because you'll be building one, winding it up, then watching planets orbit the sun at their own speed! Explore gear mechanics as yo...

How cool is it that the mainspring stores energy, then converts it to motion? Discover the physics of potential and kinetic energy and the inner wo...

Learn all about our planet's geology, geography, atmosphere, weather, and more: Magma erupts from a volcano, turbines harness the power of wind... ...

"A fun book to ignite curiosity about the solar system." — School Library JournalLearn all about rocket ships, astronauts, and the fascinating worl...

"This cheerfully-illustrated, oversized book, with its sturdy flaps, popups, pull-tabs and wheels is just too much fun!" — Redbook Magazine's Mamar...