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TIL that there are only 3 original citrus fruits: pommelo, citron and mandarin. Most other citrus fruits are hybrdis of these 3 (eg. orange= pommelo x mandarin)

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ZrJv TIL there have only been two vice presidential resignations, John Calhoun and Spiro Agnew, in United States history. If a vice president resigns, both Houses of Congress must approve any vice presidential nominee made by the President.
jeVM TIL in the 80s, when Al Gore’s wife ‘Tipper’ and her PMRC organization instituted a nation-wide campaign to sensor rock music in the US, Jello Biafa from the Dead Kennedys confronted her on the Oprah show and quite eloquently presented a case for Freedom of Speech in music.
n8wo TIL that B.F. Skinner, a famous psychologist, instilled superstitions in pigeons by giving them food in a cage at set time intervals. The pigeons responded by forming rituals, which they believed brought them the food, such as bobbing their heads or turning counter-clockwise.
8gdV TIL Rick James’ life was saved by nursing his horrible hangover. The hangover left him immobile and unable to attend a party being thrown by his friend Jay Sebring and Sharon Tate. Jay Sebring, Sharon Tate and other guests were murdered that night by the Charles Manson clan.
9wAp TIL on October 21, 1978, a 20yo Australian pilot flying over the Bass Straight reported an aircraft flying 1,000ft above him. His last transmission to ATC was “it is hovering and it’s not an aircraft”. No trace of the pilot or his aircraft have been seen since.