Smithsonian Perpetual Motion Machine bus and the lunar eclipse

and the lunar eclipse

so unless you particularly like wearing a lot of leather

The lovable Horton the Elephant is now available in adorable plush form

Easy-to-follow activities

Smithsonian Perpetual Motion Machine bus and the lunar eclipseBuild a Perpetual Motion Machine powered by an invisible magnetic field! Ever wonder why scientists, engineers, and mathematicians have never been able to create such a machine without an external energy source like batteries? Explore different kinds of motion machines and understand why they didn't work. Learn about magnets and the First and Second Laws of Thermodynamics. Understand how batteries create the magnetic force to keep the machine