Cool DownScience brain teasers require understanding of the physical or biological world and the laws that govern it.
Mrs. Duffus would often complain when Duffus left the door to the basement open. "The cool air from the basement makes the upstairs cold; close that door, Duffus!" she would rant. "It won't do any such thing," Duffus would reply and go on his way. Duffus was right, but why?
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