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TIL that the morning singing of birds is called the "dawn chorus". It is mostly male birds that sing in the morning and it is theorized that they do so to show fitness, the air and low ambient noise allows for clearer signal, and it's too dark to really do anything else.

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PMjn TIL there is less time between now and when Cleopatra reigned, then there was between Cleopatra and when most of the pyramids had been built…
neZJ7 TIL that Edgar Allan Poe is considered one of the founders of the Detective Genre. He created one of the first detectives who solves mysteries based on the facts of the crime. He is credited with inventing the “least likely suspect” trope, as well as the culprit framing another by planting evidence
loNnB TIL that the Boltzmann Brain argument suggests it is more likely for a brain to spontaneously form (complete with false memories) than it is for our universe to have formed in the first place. This leads to the conclusion that statistically, we ourselves are Boltzmann Brains.
MeynW TIL about Air Canada Flight 759, which erroneously almost landed on a packed taxiway at San Francisco International Airport. It missed one of the planes by 14 feet (4.3m). If it had crashed, it would have been the worst air disaster ever.
7L9X TIL that the Wacky Waving Inflatable Arm Flailing Tube Man was invented as an art project for the opening ceremony of the 1996 Summer Olympics