Professor Ein-O's Wind Winder teaches all about air pressure and electricity, plus you can create your own wind turbine! Conduct air pressure experiments with the foam balls. Includes Ein-O's I Know Guide. Age 7+
Availability: Expected to ship on or about 05/16/15. You may order this item now and we will ship it to you when it arrives. If you are charging this purchase to a credit card, you will not be charged for this item and its portion of your shipping charges until it is shipped.