Large Rainbow Sphere Water The high RPM propeller engine

The high RPM propeller engine makes for exciting racing with its streamlined design allowing super high top speeds

down holes

Kids can DIY with tearable scratch sheets

5 prepared slides

and encourages problem solving and narrative thinking

Large Rainbow Sphere Water The high RPM propeller engineThe Hoberman Sphere starts small and expands bigger than you'd ever expect! Made of rainbow colored plastic links, the sphere expands to 30 inches in diameter and contracts to a compact 9. 5 inches. There's a hypnotic fascination in making the sphere expand and contract over and over again, especially in a dark room because this crazy sphere glows in the dark! Want to do more with the sphere? A guide (included) lists some possibilities. How about