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Crested pigeons have specialized feathers that signal danger when they flee from an apparent threat.

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yQkdV TIL that white men 85 and older have a suicide rate that is six times that of the overall national rate.
WkRrN TIL Sylvester Stallone's main inspiration for Rocky was his dog, Butkus the Bull Mastiff
0w5by TIL In a study on lung cancer patients, 48% of subjects had quit smoking prior to diagnosis, usually easily, despite prior attempts. Lung cancer tumors secrete a substance that disrupts nicotine addiction, but the study was buried because scientists worried it would encourage people to keep smoking.
1aENr TIL that the original choice for the capital city of Australia was Dalgety, a town of now only 205 people
1axd4 TIL The "Jesus Nut" or "Jesus Pin" is the only component holding the rotor blades on certain helicopters. It was nicknamed during the Vietnam war because if it were to fail in flight, the rotor blades would lift off of the helicopter and the crew would have nothing else to do but pray to Jesus.