› added 1 week ago

TIL about the ‘Doppler effect’ which explains why a siren's pitch changes as it passes by

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via reddit.com

4kaLa TIL That pencils were painted yellow to appeal to the Asian market. Yellow represented health and prosperity.
yQ5da TIL: Hypothermia is extremely useful in treating brain injuries, and is suspected to be helpful for the heart when applied in a medical environment
bKlQ TIL an octopus named Otto caused an aquarium power outage by climbing to the edge of his tank and shooting a jet of water at a bright light that was annoying him. He’s also been seen juggling hermit crabs, throwing rocks at the glass and re-arranging his tank surroundings.
DZvv TIL the man who runs Khan Academy has three degrees from MIT as well as an MBA from Harvard
VMd9m TIL that Maillard reaction is responsible for the colours / flavours of french fries, steaks, dumplings, cookies, toasted marshmallows & more. Described first in 1912, it is a chemical reaction b/w amino acids & reducing sugars and based on constituents, it can result in 100s of flavours.