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TIL the Empire State Building was referred to as the Empty State Building during the Great Depression. One original tenant, a jeweler, had a place there from 1931 to 2008

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rgnx TIL doctors from UCLA found unique blood cells that can help fight infections in a man from Seattle’s spleen, so they stole the cells from his body and developed it into medicine without paying him, getting his consent, or even letting him know they were doing it.
8yRX TIL animals devote so much energy to getting laid that an effective parasite strategy involves disabling the host’s reproductive capabilities and drive, freeing up resources for the parasite and sometimes even extending the host’s lifespan.
BgNOx TIL of the walking catfish, which is able to breathe air and use its pectoral fins to "walk" and move to different aquatic environments. Native to Southeast Asia, it became an invasive species in Florida during the 1960s and has been sighted in California, Connecticut, Georgia, and England.
w0wW TIL that earthworms do NOT surface to avoid drowning when it rains… Instead, they come to the surface to move overland. Since worms breathe through their skin, the skin must stay wet in order for the oxygen to pass through it. And earthworms can actually survive for several weeks under water…
Jdd8 TIL that domain names were free until 1995.