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TIL bumblebees are capable of flying at altitudes much higher than Mount Everest. Two bumblebees were placed inside a plexiglass chamber and were able to reach a simulated altitude of 29,525 ft with air pressure being reduced. The chamber kept breaking before the bumblebees stopped flying.

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loQDN TIL that your nose only breathes using one nostril at a time, and that the nostril in use switches every few hours. This "nasal cycle" is dictated by the same system that regulates heart rate and other unconscious bodily functions and is the reason why only one nostril gets stuffy at a time.
QJmp9 TIL "Snakes and Ladders" originated in Ancient India, its main purpose was to teach morals and lessons about karma in a way that young children would understand and remember. The ladders signify good deeds while the snakes represent all the evil we do
78ejM TIL about Third Man Syndrome. An unseen presence reported by mountain climbers and explorers during traumatic survival situations that talks to the victim, gives practical advise and encouragement.
LQrv0 TIL That upon her marriage, Olivia Wilde became a princess of the Papal nobility.
XE4VR TIL British spymaster Sir Mansfield Smith-Cumming, the first head of the MI6 and the inspiration of James Bond's M, started the practice of using semen as invisible ink during WWI. It worked well, until they realised that the letters smelled awful when received.