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TIL REM sleep improves creativity by priming associative networks

Read more ncbi.nlm.nih.gov

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R7ww6 TIL A Killer Whale learned to mimic human words such as 'Hello' and 'Bye Bye.' The first of its kind to copy human speech. Whales and Dolphins are among the few animals other than humans which can learn to produce sound simply by hearing them.
wWv8 TIL There’s a small underground railway in London devoted to delivering mail
W7YNX TIL Ketchup has to be a certain weight to be considered “Fancy”.
KYDYB TIL that the sun loses 4.4 million tons of mass per second due to the light that it emits.
QJR5E TIL of an organization in Belgium training giant rats (nicknamed "HeroRATs") to sniff out landmines in countries where explosive remnants of war pose a large threat to communities. The rats are extremely effective, outperforming both metal detectors and bomb-sniffing dogs.