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TIL the 10th U.S. President, John Tyler (b. 1790), has surviving grandchildren to this day. He had a son when he was 63, and that son had children at ages 71 and 75. Those grandchildren are now 89 and 93.

d8QO7 TIL that the planet Neptune, which can only be seen by telescope, was mathematically predicted before it was directly observed for the first time on the night of September 23–24, 1846, at the Berlin Observatory, by astronomer Johann Gottfried.
N7MZ6 TIL of the Saola, or Asian Unicorn, a bovine so rare it has been photographed in the wild only 4 times. When it was discovered in 1992 it was the first large mammal to be defined in over half a century.
ADneo TIL that in February 1970, an amateur photographer was taking photos around an airport in Sydney, Australia. It was only after the film was developed that he realized he captured a stowaway's final moments as he fell out of the wheel well of a plane taking off and fell 56 meters to his death.
Qpda TIL “Gringo” did not originate in Mexico to describe Americans, but in Spain in the 1700’s to describe foreigners whose speech was incomprehensible. Gringo likely came from the word “griego” meaning Greek, which in Spanish was used in the same way as English, “it’s Greek to me” (hablar in griego).
ZryR TIL William Bradford, governor of Plymouth Colony, was a year old when his father died so he was sent to live with his grandfather, who died two years later so he was sent to live with his mother, she died one year later.