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TIL in 1880 a guy built a 200ft 14 storey tower made out of concrete with no steel reinforcement. It’s still standing today, 140 years later, and is the tallest non-reinforced concrete structure in the world. It was designed as his mausoleum.

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VB6np TIL that an 11 year old accidentally invented popsicle
dod7 TIL that in 1968 a US plane carrying four H-bombs crashed into sea ice in Greenland and exploded, contaminating the area around the site with radiation.
mx9JR TIL the only person to die playing baseball is Ray Chapman in 1920 at age 29; he was hit by a pitch and died 12 hours later. His death helped lead to the ban on spitballs after the season and requiring umpires to replace dirty balls. It helped lead to the use of batting helmets albeit 30 years later
LQpnV TIL that some bottle-fed llamas might go crazy, turn against their owners, and attack them because they consider them herd rivals
696K8 TIL a 32 year long study found obesity spread through social circles, and that a person's chances of becoming obese increased by 57% if he or she had a friend who became obese