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TIL The bottlenose dolphin sleeps by shutting down half its brain along with the opposite eye. The other half remains awake at a low level of alertness to watch for predators and to surface to breath. After about two hours it reverses the process so the other half can rest.

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DpmD TIL GlaxoSmithKline knew that the anti-depressant drug paroxetine didn’t work in adolescents and increased their risk of suicide, yet didn’t divulge the information as “it would be commercially unacceptable to include a statement that efficacy had not been demonstrated.”
85GX TIL Springsteen’s Born In The USA was about the harmful effects of the Vietnam War on Americans and the treatment of Vietnam veterans upon their return home.
XE44k TIL that hidden camera porn is so pervasive in South Korea that the authorities in Seoul have established a squad of investigators tasked with inspecting public bathrooms for hidden cameras.
M7Qem TIL I learned how Champollion cracked the ancient Egyptian hieroglyphic writing. The reason why he succeeded -23 years after the Rosetta Stone discovery- is that he spoke Coptic, and it meant that the sounds written in hieroglyphs made sense to him.
69NE7 TIL lumps of ice from 5 kg to more than 50 kg in mass can form in the atmosphere and hit the ground like a meteor.