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TIL of the McCollough effect, a visual phenomenon which alters perception of horizontal and vertical lines. The effect can last for up to three months, if the viewer looks at the images that trigger it long enough.

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8aGV4 TIL that even the typographer who designed Comic Sans only used it once, and that was to send a letter to Sky for his broadband problem.
9wLvQ TIL JFK’s last words were “No, they sure can’t” in response to Nellie Connally, First Lady of Dallas, who remarked “Mr. President, they can’t make you believe now that there are not some in Dallas who love you and appreciate you, can they?”
nW8KP TIL the jones beach water tower (know locally as the pencil) situated in the roundabout in jones beach wantah, ny is modeled after St Mark's Campanile in Venice.
4kK96 TIL about Mars Direct, a 1989 plan to get humans to Mars within ten years, using just two launches of a large rocket system and utilising local Martian resources
Y7PQA TIL about Low-background steel, any steel produced prior to the detonation of the first nuclear bombs in the 1940s and 1950s and now typically found in shipwrecks. It is often used for modern particle detectors because more modern steel is contaminated with traces of nuclear fallout.