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TIL American life expectancy increased during the Great Depression

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r1aM TIL That the Kowloon walled city in Hong Kong was home to 33,000 residents all of which lived in hundreds of interconnected high rise buildings crammed into a 210m x 120m space. The construction was so dense that sunlight didn’t filter down to the lower levels. Photos in link.
rRAox TIL Mars Corporation discontinued a candy bar with $50m in sales because the Mars family did not like peanut butter
Ypp7P TIL that cats can recognize their owners voices, just never evolved to care
kOxK4 TIL that the Great Smog of London killed in only 4 days, 4.000 people, made 150.000 people ill and killed 8.000 additional people in the months that followed of related diseases whereas in the Chernobyl disaster 31 people died and an additional 4.000 died of related diseases.
pYNNA TIL about Sequoyah, a Native American of the early 19th centruy who, just seeing white people writing, understood what writing was and created, all by himself, an advanced syllabary system. After some years, more than 90% of Cherooke people were able to read.