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TIL: Between 1940 and 1970 Harvard and Yale took nude photos of incoming freshmen

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via reddit.com

WkKAX TIL that Facebook conducted a study where they intentionally manipulated almost 700,000 users’ emotions without their knowledge or permission
VMkaD TIL In 1993, 16-year-old Keron Thomas posed as a train conductor and drove an A train for three hours and safely delivered passengers to their destinations before he accidentally triggered an emergency brake on a fast curve.
4bAb TIL all steel produced after 1945 is contaminated with background radiation because of the use of nuclear weapons. Such steel is unusable for many scientific and medical applications and steel made before 1945, often taken from sunken battleships, must be used instead.
78VYP TIL: each 13.5 inch Oscar statue is plated with 1.5 times as much gold as the 21+ foot James Webb Space Telescope mirrors
oBGGA TIL Cats have vision similar to colour-blind humans. Cats can only see shades of blue and green. They may find red and pinks confusing (they may appear greener), while purple may look like another shade of blue.