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TIL the sodium vapor process (aka yellowscreen) was extensively used by Disney as an alternative to the better-known bluescreen, to composite actors and background footage with less side effects on human skin tones. It featured in Mary Poppins (1964), and Dick Tracy (1990) marked its last known use.

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6EdvX TIL about asteroid J002E3, which was discovered 16 years ago orbiting the earth. It turned out to be the 3rd stage of Apollo 12, which had come back to earth orbit after going around the sun for over 30 years.
MeOvm TIL of Harlon Block, a marine who raised the flag on Iwo Jima but then died soon after. He was misidentified in the famous picture for 2 years but his mother knew it was him. Looking at the photo she exclaimed “I’ve changed so many diapers on that boy’s butt, I know it’s my boy"
7pMO TIL that (very) rough estimates suggest that Wikipedia contains about 4% of the extant sum of all human knowledge, with 5.6 million red links (and growing).
j5BQ TIL a McDonald’s franchisee invented the Filet-O-Fish as a option for Lent. McDonald’s owner Ray Kroc wanted to sell the Hula burger (Pineapple on a bun) instead and held a sales contest. The Filet-O-Fish won hands down
yQZaw TIL Pasquale Buzzelli lost consciousness in a North Tower stairway during the building collapse on 9/11. He awoke at 3:00 PM that day to find himself lying atop the debris with only a fractured foot.