Can you pass this History quiz?
Which scientist developed his theories of black holes in the 1970s?
Stephen Hawking
Stephen Jay Gould
Donald Johanson
Georges Kohler
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There are 5 black cats and 6 white cats. They are all five years old. Each black cat each weighs 12 pounds. Each white cat weighs 15 pounds. How much do they weigh altogether?
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Which scientist developed his theories of black holes in the 1970s?