You are given two ropes and a lighter. Each of the two ropes has the following property: if you light one end of the rope, it will take exactly one hour to burn to the other end. It doesn’t necessarily burn at a uniform rate. How can you measure a period of 45 minutes?
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For her birthday, I bought my daughter a set of five nested wooden dolls, similar to those originating in China. The set appears as one do...
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1. Poor people have it. Rich people need it. If you eat it , you die. What is it? 2. If you don't keep me, I will break. 3. Take o...
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How many places are there on earth where one could walk one mile south, then one mile west, then one mile north and end up in the same spo...
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