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Barbie's little sister is Skipper.

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Which scientist developed his theories of black holes in the 1970s?

Stephen Hawking Stephen Jay Gould Donald Johanson Georges Kohler

How Many is “Many,” or What is the Largest Possible Number?

As soon as a child gets to know the difference between “singular” and “plural,” he/she unconsciously wants to find out how many is “many,” or whether there is a number to quantify everything in the Universe.