The fact is that solving problems is hard. If a given problem still exists, you can bet that a lot of people have already come along and failed to solve it. Easy problems evaporate; it is the hard ones that linger. Furthermore, it takes a lot of time to track down, organize, and analyze the data to answer even one small question well.
All Excerpts From
Steven D. Levitt & Stephen J. Dubner. "Think Like a Freak." iBooks.
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