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TIL that Submarines and Space Stations burn special candles as a means to produce oxygen, which can be used as a backup if their electronic oxygen-producing systems fail.

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BrRYe TIL Nanocardboard is made out of an aluminum oxide film with a thickness of tens of nanometers. Its sandwich structure, similar to that of corrugated cardboard, makes it more than 10,000x as stiff as a solid plate of the same mass. Shining a light on a piece of nanocardboard allows it to levitate.
rNNm4 TIL hummingbird feeders need daily cleaning in hot weather bc nectar spoils in heat & sickens the birds. Several ways to protect their food from overheating include: place feeders in shade, freeze nectar into small cubes & fill feeders with them to delay heating, wrap in foil, use glass feeders.
mxLv TIL that Christopher Lloyd had his first on screen kiss in “Back to the future 3” despite being an actor for almost twenty years before that.
QJdDa Today I learned that trees are able to communicate with other trees through chemical, hormonal and slow-pulsing electrical signals, and can communicate through the air with pheromones and other scents. They will also help other struggling trees by sending them nutrients through their roots.
OGmB4 TIL In 1936, Japanese Prime Minister Keisuke Okada was nearly assassinated in an attempted coup. The assassins stormed his residence and killed a man they identified as Okada by comparing the dead man’s face to a picture of their intended target. The dead man was actually Okada’s brother-in-law.