Smithsonian Perpetual Motion Machine bus 5" length by 11" height

5" length by 11" height and 4

Luckily I met the Mini Squishable Monarch Butterfly and it was like pro-butterfly therapy

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

and the lunar eclipse

Easy-to-follow activities

Smithsonian Perpetual Motion Machine bus 5" length by 11" heightBuild 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