The Colossal Book of Short Puzzles and Problems Cups Each 3D printed pyramid has

Each 3D printed pyramid has a unique color gradient so the one you receive may not look exactly like what you see in the attached images (but it will be similar)

Sizing: 9” Wide x 5

Author: Hoffman

Simply place the stirling engine on top of a hot beverage (or any hot surface) and give the wheel a turn

Ever felt like bending space time

The Colossal Book of Short Puzzles and Problems Cups Each 3D printed pyramid hasThis link will take you to Amazon for final purchase but STEMerch will get a commission on qualified sales. Author: Gardner, Martin Number Of Pages: 512 One of the biggest books on math puzzles you could probably find.