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TIL that alexandrite, a gemstone found in the Ural mountains, will shine different colours if it is viewed under natural or artificial light

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NXPgQ TIL that the Portuguese man o’ war is named due to its resemblance to the caravel, a sailing ship also known as a Portuguese man o’ war.
5vpp TIL the University of California pays its coaches more than they do their Nobel winning professors–on average, three times more than the system’s full-time Nobel laureates.
Z86lG TIL there is a blood sport known as Spider Fighting, where two spiders are placed on opposite ends of a stick and pushed towards the middle to fight one another. In 2002, inmates in a Florida prison got into a fight resulting in life threatening injuries over the theft of a pet fighting spider.
NNJb Scientists detected an atomic nucleus traveling at 99.9999999999999% of the speed of light, with energy 20 quintillion times that of visible light. It was appropriately named the “Oh-My-God Particle.”
BrBmK TIL about dry ice on Mars. This is a winter image of dry ice on Mars showing eroded channels filled with frozen carbon dioxide that appear like white ghostly spiders. During the Martian summer the ice will sublimate into the atmosphere, leaving the empty channels behind until Martian winter returns.