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TIL that there is a algae called Sailor's Eyeball and it is one of the largest unicellular organisms in the world, with a diameter up to 5.1 cm. Although their actual color is green, they appear to be silver or blackish in water, depending on chloroplast quantity.

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1ab6V TIL that Gil Scott-Heron's song "The Revolution Will Not Be Televised" was a response to the spoken-word piece "When the Revolution Comes" by The Last Poets and which opens with the line "When the revolution comes some of us will probably catch it on TV".
OKw6 TIL of Positronium, a nearly massless element made out of a meta-stable mix of matter and antimatter with no protons or neutrons. It can even form chemical compounds such as Positronium Hydride. When it does collapse, it releases pure energy as flash of gamma radiation, leaving nothing behind.
wLPK8 TIL of Herostratus, a 4th century BC Greek arsonist who burned down the Temple of Artemis, considered one of the 7 wonders of the ancient world. He said he had done it to immortalise his name. He was executed him and a law was passed forbidding anyone from saying his name, under penalty of death.
lw9A TIL Poverty Kills More People Every Year Than Either Of the Top Killers – Heart Disease or Cancer
ZNna TIL the Iron Sheik planned to kill the man who murdered his daughter by slitting his throat with a razor he hid in his mouth in the courtroom court. His family surrounded him and talked him out of it. Instead, as a tribute to his daughter, he quit drugs and got his life back on track.