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Whether you're studying mycology
Celebrates one of North America's most recognizable native moths
polished surfaces highlight the texture and structure of the stone
Each necklace is unique
curiosity-driven design
Smithsonian Perpetual Motion Machine Books Whether you're studying mycologyBuild 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 didnt work. Learn about magnets and the First and Second Laws of Thermodynamics. Understand how batteries create the magnetic force to keep the machine
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