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Thursday, September 17, 2026

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By the Numbers

2,500 miles

The distance three wild dog brothers trekked across Zambia in search of mates and territory. That makes their odyssey the longest recorded movement by any African mammal, surpassing every tracked journey by elephants, lions, or other wild dogs.

Source: Smithsonian

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What's Ahead
  • Today: Constitution Day marks 239 years since delegates signed the U.S. Constitution in Philadelphia in 1787.

  • Tuesday, Sept. 22: The autumnal equinox arrives, marking the official start of fall in the Northern Hemisphere.

See the full week’s calendar →

On This Day
  • 1787Delegates sign the US Constitution at the Constitutional Convention in Philadelphia
  • 1862The Battle of Antietam becomes the bloodiest single day in American military history
  • 1908Thomas Selfridge dies in a Wright Flyer crash, aviation's first airplane fatality
  • 1976NASA unveils the Space Shuttle Enterprise, its first orbiter, in Palmdale, California

The Historybook →

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