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TIL that dogs can detect oncoming seizures/epileptic fits by smelling the odour molecules released by the human body before a seizure/fit occurs

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mdeY TIL in 1918 a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
loQW1 TIL NASA's first Mobile Quarantine Facility (MQF-001), a modified 35-foot Airstream trailer to provide biological isolation for astronauts was transferred in the 1970s to the US Department of Agriculture for field work, but its current whereabouts are unknown.
NjeN TIL squirrels do not use sense of smell to find the hundreds of locations where they stored nuts for winters, instead they rely on spatial memory to remember location of each nut. A feat possible because of significantly larger hippocampus in rodent species.
XEeej TIL Norway wanted to give Finland a mountain for its 100th birthday
eppXJ TILT there were (twin) pregnancies wherein the more developed kid pumps blood for both the twins (acardiac and cardiac), and the acardiac twin cannot reciprocate it in any way, therefore causing cardiac failure in the developed one.