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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.

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pMyb TIL that the elusive “dark matter” in the universe could be detected by looking for time glitches in the existing network of GPS satellites. One researcher is already mining 15 years’ worth of GPS timing data for its signature.
0dpBL TIL the studio behind the movie Se7en proposed a sequel called "Ei8ht" where a suddenly psychic Morgan Freeman chases an also psychic serial killer. The idea was dropped after director David Fincher replied, "I would be less interested in that than I would in having cigarettes put out in my eyes."
WdwA TIL that a sandwich has ~16x the energy density of a Lithium-Ion battery.
b9al4 Today I learned that non-spayed female ferrets will die if they don't have sex. They go into season and don't come out until they have mated, and the associated elevated oestrogen levels eventually cause anemia and death.
loYdN TIL while recovering from a plane crash, Howard Hughes decided he didn't like his bed so he called in a group of engineers to design a new one which served as a prototype for modern hospital beds