Weather vanes have arrows that point in the direction that wind is coming from, and this is achieved through differing surface areas on either side of the arrow. Discover how wind pushes the large surface area side of a weather vane around withhelp from a science teacher and field biologist in this free video on weather. Expert: Brian Erickson Contact: Ericksontutoring.blogspot.com Bio: Brian Erickson is a tutor in math and science, as well as a field biologist. Filmmaker: Todd Green

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