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TIL Cross circulation where a second human (usually they patient's father) was used as a heart bypass 'machine' was used for the first surgeries to fix congenital heart defects in children.

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GAQY5 TIL Every year, feral cats kill 1.4 billion native animals in Australia
v1wbD TIL: Handshakes originated as a way to see if the person you met was armed. You took their hand to see if it was empty and shook it to confirm they had no weapons up their sleeve.
x60w TIL Pablo Picasso was going to brothels by the age of 13.
1D17 TIL that there are 14 people in the world with ‘keys’ to internet worldwide security ( 7 primary keepers, 7 back-up). They serve as a last-resort measure to reconstruct the system if something calamitous were to happen to the internet.
4o1a TIL The lump you feel in your throat when you’re nervous or crying is an autonomic response to stress that expands the glottis in an attempt to provide you with more oxygen.