Yesterday's Answer:
The four basic forces that act on an airplane in flight are thrust, lift, weight, and drag.
Today's Question:
When are crepuscular animals primarily active?
I don't know this one.
(Sources: American Mensa, email transmission, November 7, 2011; http://www.youtube.com/watch?v=1GIbZiN11ik)
Compiled by Otto and Patricia Ladensack
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