After helping the staff of Popular Mechanics learn how to build a backyard weather station for the print magazine, ABC News Chief Meteorologist Ginger Zee calls in to explain how snow works and what you can do about it. Roy Berendsohn helps Kevin Dupzyk get his Christmas tree straight, and we ill-advisedly speed-taste a beer advent calendar. Beer-vent calendar? We're calling it a beer-vent calendar. 

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