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TIL 2013 was the first year since 1987 to feature four different numbers

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R5dn8 TIL the largest gallstone ever record was 13lbs 4oz
5VKe9 TIL the BBC’s Ceefax officially launched on 23 September 1974, making it the world’s first teletext service. It began as an experiment to provide subtitles for the hearing impaired but expanded to include news, weather, and sports.
d8Klj TIL until modern times, when artificial lighting allowed us to stay awake longer, most people would go to bed around sunset. The actual time spent sleeping was split into two phases – known as first sleep and second sleep.
okmR TIL NASA’s first trip into space was made possible by Katherine Johnson, an African American scientist who was in charge of calculating the rocket’s flight trajectory. Her work was so trusted that, even after NASA had switched to computers, they would call on her to check for any mistakes.
6YQ7 TIL it is a cultural taboo to smile in public in Russia and it is considered disrespectful to smile when meeting strangers