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When humans see purple, we’re really seeing a blend of red and blue light. Hummingbirds see purple plus ultraviolet—and lots of other nonspectral colors. A new study found that the birds could see every nonspectral color that the researchers threw at them.

Read more arstechnica.com

8aYJK TIL multiple states on the East Coast of the U.S. had official programs to pressure freed African Americans to move back to Africa.
m1x6O TIL about Joe Kieyoomia, a Navajo soldier who survived both the Bataan Death March and the atomic bombing of Nagasaki. He was tortured more than other prisoners because he was mistaken for being a Japanese American traitor. After the war he returned home to New Mexico and lived to 77.
vPbZR TIL that American women had to wait until 1988 to be allowed to take out business loans without the signature of a male relative.
OW67 TIL James Cameron pitched the sequel to Alien by writing the title on a chalkboard, adding an “s”, then turning it into a dollar sign spelling “Alien$”. The project received $18 million dollars.
kJaK7 TIL 1970s ABA & NBA player John Brisker disappeared and was rumored to have been killed and eaten by dictator Idi Amin in Uganda.