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TIL Earths relationship with the Moon is bound unbelievably to the golden ratio. If Earths radius = 1 and the moon equals 0.272 that makes 1.272 (square root of phi). Draw a triangle with one line at a value of 1 and the second at a value of 1.272 and then hypotenuse (third line) is 1.618 or phi

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grdBb TIL an infection model explains why spiral galaxies have spiral arms—the deaths of massive stars trigger star formation elsewhere (infection), while their vicinities recover due to the dispersed material; this propagation/recovery and the galaxy's rotation leads to the spiral structures
neg7W TIL according to the most recent estimates from the U.S. Census Bureau, the average age of first marriage for women in 2017 was 27.4 years and for men it was 29.5 years. In 1990, the average age of marriage for women was 24; in 1980 it was 22; and back in the 1950s, it was only 20.
R7W5l TIL that the oldest song in the world was written 3,400 years ago, based on a ‘sheet’ of music which was discovered in the ancient Syrian city of Ugarit.
4XOAb TIL Sejong the Great (King of Korea), invented the Korean alphabet. While Korean was spoken, it used the Chinese alphabet which Koreans found confusing. This led to high illiteracy. King Sejong decided a new alphabet would fix the issue, so he invented one.
jNkgv TIL the community of Rudyard Montana is the only town or census-designated place in the lower 48 states of the USA to have a non-oceanic antipode; the only place you could proverbially dig a hole and end up on dry land.