A piece of surfaced (sanded smooth) 2×4 lumber actually measures 1½ inches thick and 3½ inches wide. In rough-cut condition, a 2×4 is slightly less than 2 inches thick and approximately 4 inches wide. When wood is milled from a rough to a smooth surface, it loses about ¼-inch from each of its four sides.
Our studies at University College London have shown that the cerebellum can predict sensations when your own movement causes them but not when someone else does. When you try to tickle yourself, the cerebellum predicts the sensation and this prediction is used to cancel the response of other brain areas to the tickle.
In 2013, about 134.51 billion gallons1 (or 3.20 billion barrels) of gasoline were consumed2 in the United States, a daily average of about 368.51 million gallons (or 8.77 million barrels). This was about 6% less than the record high of about 142.35 billion gallons (or 3.39 billion barrels) consumed in 2007.