give and take

From: Bruce Crain (
Date: Mon Jan 21 2002 - 14:23:36 PST

What is the name of the "wind mill" type device whose "vanes" are painted
black on one side and white on the other and therefore spin when put into
sunlight also showing, like this science snack, that light contains energy?
Thanks for your response?

Bruce Crain
Director Global Alliances
925-600-3103 office
925-260-1976 mobile

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