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TIL that Brooke Greenberg, who died in 2013, was the only person in the world with ‘Syndrome X’, which made her remain physically and cognitively similar to a 1 year old, despite being 20 years old at the time of her death.

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64pJ TIL that the word “yolk” is derived from an Old English word that means “yellow.” So egg white and egg yellow.
ADAm7 TIL Greenland sharks are the longest living vertebrates on Earth with one female being carbon dated at about 400 years old. The sharks grow at just 1cm a year, and reach sexual maturity at about the age of 150.
78lgP TIL in 1981, Mauritania was the last country in the world to abolish slavery. The ban wasn't enforced till 2007. In 2017 600,000 were still living in slavery, and only 1 person was prosecuted for owning slaves.
mxxeE Our fear of fevers made us terrified of even a slight increase in body temperature.
9YXNp TIL about the blanket octopus, named for the sheets of thin webbing between its arms. Females can reach over 6' (1.9m) in length, while males are approximately the size of a walnut. This is the most extreme case of sexual size dimorphism found in nature.