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TIL that researchers raised a lung-bearing fish called the bichir entirely on land in order to study how its behavior and anatomy adapts, hoping to better understand the steps which led to the evolution of tetrapods

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66vw TIL Felix Landau, of the Nazi Einsatzgruppen (death squads), once shot and killed the Jewish personal dentist of a fellow officer. That officer, as an act of revenge, killed Landau’s ‘favorite jew’, the artist Bruno Schulz. He later told Landau “You killed my jew - I killed yours.”
0wmAv TIL our skin is covered in invisible stripes. First observed by Alfred Blaschko in the early 1900s, they appeared not to follow any known body system. Visible only under UV light, these stripes now known to be cellular relics of fetal development from singular-cell beings to fully formed humans.
gM7yb Today I learned that a German company sold radioactive toothpaste containing thorium until the US nuked Hiroshima and Nagasaki (Source in German)
KYQv6 TIL that Indiana cardiologist Edward Harlamert broke the Guinness World Record for stents (34) by implanting at least 41 into his patient's coronary arteries, for a total of 48 stents in the man's chest. (Harlamert is now named in a malpractice complaint for stents by said patient and others.)
lgpB TIL that when parents show favoritism or interfere in sibling conflict, those siblings are more likely to tend to conflict later in life, and less likely to collaborate in the care of the older parents.