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TIL "Green Screening" is known as a "Chroma Key" in the television and movie industry since any distinct and uniform color can be used--not just green--as long as the foreground is visually different from the background.

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VnQ4 TIL a bag of Skittles contains fifty percent of your daily recommended vitamin C.
5Y6ZB TIL that one of the few cases of a child actually dying from intentionally poisoned Halloween candy was Timothy O'Bryan. The Culprit had been his own father Ronald, who had laced his pixy sticks with cyanide to claim his life insurance.
P1YDg TIL the ruins of "Great Zimbabwe" in Africa were constructed with geometric precision instead of mortar and had religious sculptures matching the sophistication of other medieval civilizations. Chinese and Persian artifacts found at the site also prove they had far-reaching trade networks.
lom1K TIL the Titanic's watertight compartments likely caused its rapid sinking by keeping too much water weight in the bow of the boat. Without the compartments, the ship would have remained horizontal and taken several hours to sink allowing nearby ships to rescue all passengers in time.
EaEx TIL that the summit of Mount Everest is not the farthest point from the center of the Earth. Due to the Earth’s bulge around the equator it is actually the volcano called Chimborazo in Ecuador.