Overview
Why are 1997 dollar bills worth more than 1980 dollar bills?
In a box there are 20 balls, 10 white and 10 black. With a blindfold on, what is the least number you must draw out in order to get a pair of balls that matches?
Which clock keeps the best time? The clock that loses a minute a day or one that doesn't run at all?
I have two current U.S. coins in my hand. The two coins add up to 15?. One of the coins is not a nickel. What two coins do I have?
How much dirt is there in a hole that is 1 foot wide by 1 foot long by 1 foot deep?
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