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Til when sea ice cracks, pools of brine can leak into the sea, but the process can make hollow icycles, carrying the brine to the floor, freezing bottom-dwelling ocean life

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rZn1 TIL that, in 2004, 21 percent of people aged 18 to 29 cited “The Daily Show” as where they learned presidential campaign news, even though the show’s own producers (including Jon Stewart) ridiculed the very idea of people looking to their programme as a primary news source.
VMoKB TIL there is a supermassive void in space called the Boötes void and if the Milky Way had been in the center of the void, we wouldn't have known there were other galaxies until the 1960s. The void is 0.27% the width of the entire observable universe.
AbVn TIL that since there is an exact number of weeks in a 400-year period (20,871 weeks), the day of the week exactly 400 years ago was the same as it is today. Thus, October 26, 1615 was a Monday.
4knvo TIL in the 1880s, the Harvard Observatory director was frustrated with his staff, and would say "My Scottish maid could do better!" So, he hired his Scottish maid. Williamina Fleming ran a team for decades, classified tens of thousands of stars, & discovered white dwarfs and the Horsehead Nebula.
WpMN TIL residential electrical outlets are usually turned “upside down” to denote that they are connected to a wall-switch.