The first 100 people to use code SCIENCE at the link below will get 60% off of Incogni: https://incogni.com/science
Perpetual motion is impossible but this device simulates what it might look like and it uses some really clever engineering.
Buy a perpetual motion simulator here: https://www.etsy.com/shop/backtonaturedecor
You can buy my books here:
just like these amazing people:
Lizzy and Jack