Rattleback Pk 2 Celt Stone Science Curiosity

 

This 3-3/4 inch (9.5 cm) long plastic toy mysteriously reverses its direction while spinning. Two on an illustrated blister card. A science curiosity whose ancient and mysterious properties capture the attention of all ages. This little oddity has a natural spin bias and is a cylinder lens that magnifies vertically. Rattlebacks were discovered by archeologists and were originally called celt stones. Rattlebacks are designed to only spin in one direction. If you try to spin it in the opposite direction a rattleback will slow down, stop and reverse direction. How can it do that? Explanations are included. 2 Rattlebacks come in a blister pack. There are many websites detailing the math behind this! Fascinating!

Assorted Colors Yours will be chosen at random from stock.