Smithsonian Perpetual Motion Machine Plush Expertly crafted from research-grade polyresin

Expertly crafted from research-grade polyresin and hand-painted

this puzzle provides an engaging introduction to problem-solving and hands-on play for young puzzlers

Wrap your finger in oceanic flair with this Octopus Tentacle Ring

Standard 54‑card set with detailed moon imagery that makes each card a little lesson in lunar science

Smithsonian Perpetual Motion Machine Plush Expertly crafted from research-grade polyresinBuild 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