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TIL that depressed people literally see the world in a darker color.

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4XkDX TIL that after a sufficiently long haul of insert/delete operations on a Binary Search Tree, the height of the tree degrades to O(sqrt(n)) and does not remain O(logn) mainly because of the fact that Hibbard Deletions lead to an asymmetric tree structure.
b6owQ TIL: The degree of sexual dimorphism in common blanket octopus is very high, with females growing up to two meters in length, whereas males grow to about 2.4 cm.
DYde TIL that a librarian found smallpox scabs stored inside a 19th century medical book. In the 1800s scabs from infected people would be inserted into healthy people as a means of vaccination. These scabs have the potential to shed light on The evolution of the small pox vaccine used in the Us today.
x65Bg TIL there is an University in Pyongyang, North Korea known as PUST that teaches entirely in English. It also operates its own social media accounts. Foreign academics can apply to volunteer to lecture at the University in-person or online.
p8gB8 TIL of tree man syndrome, a rare gene mutation that makes people highly susceptible to HPV and causes severe deformity.