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TIL of Uncle O’Grimacey, a McDonaldland character introduced in 1977 to promote the Shamrock Shake.

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j6Obj TIL the SS Robert E. Lee was torpedoed by a German U-boat just 45 miles off the Louisiana coast in 1942. It sank in 15 minutes, killing 25 people. Decades later, both the ship and the U-boat that sank it were found just a mile apart on the seafloor.
4Byo TIL Omicron Persei is a real star about 1000 light years away from Earth
EZA0 TIL skinny jeans can cause nerve damage
x6vOb TIL about the Personal Rescue Enclosure or "rescue ball", a 36 inches (91 cm) sphere intended to protect an astronaut in space in case they had to leave the Space Shuttle; another suited astronaut would then carry the sphere. It was developed in the early days of the Shuttle program but never flown.
XxDR TIL that in String Theory, the size of ‘Strings’ in a hydrogen molecule would be relative in size to the width of human hair to the Milky Way