As part of a lesson on solar energy during the winter summit, YES!
students unfurled a 50-foot-long, black-colored tube of thin plastic and allowed outside air to fill it. As the air in the tube warmed, it expanded and the thin plastic tube soon had lift.
(Tribune photo by Tom Cherveny)
Say YES! to a head start in clean energy
It was for a practical reason that architect Andrew Bjur of Engan and Associates in Willmar put in the effort to add "LEED certified" to his list of credentials.
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