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TIL goldfish have a pigment in their skin which is sensitive to the amount of light. If they don't get enough light exposure, they can eventually turn white.

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DW6P TIL that when Giacomo Casanova was forty years old, he purchased a thirteen-year-old girl in St. Petersburg as a sexual slave
KY8b9 TIL that Persian and Farsi are just different names for the same language
N7GjP TIL the longest living vertebrate species is the Greenland Shark, reaching sexual maturity at 150 years old. The oldest known individual of the species is almost certainly older than the United States.
X0Jl8 TIL that 8 of the top 10 biggest stadiums by capacity in the world belong to American university football teams. Also, the second biggest stadium is in North Korea.
X0aGr TIL the literacy rate grew in India by 97% between 2001 and 2011. The literacy rate among women is 70% and 85% for men.