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mathematics
A perfect number is one whose proper factors add up to the number. For example, 6 = 1+2+3. What's the next "perfect number"?
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28 = 1+2+4+7+14
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geography
There are two US states each of which borders 8 other states. Can you name either one?
geography
There are two US states each of which borders 8 other states. Can you name either one?
history
The Pony Express mail service, established in 1860, could carry mail by horseback 2,000 miles in 10 days. What were the easternmost and westernmost states of this rapid mail service?
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