Tuesday, 9 October 2007

10 Great Unsolved Problems

including the Great Depression, origin of language, the Industrial Revolution, black holes and dreams...

10 Great Unsolved Problems

from The List Universe by jfrater
In various fields of human study there are problems that have never been solved. Some theories have been put forward, but not one fully satisfies the question. So put on your thinking cap and see if you can solve any of the ten unsolved problems listed here: 10. What caused the great depression?
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