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TIL that Philips and Sony designed their first audio CDs to hold up to 74 minutes to ensure they could hold a complete recording of Beethoven’s 9th Symphony.

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6xKZ TIL…..There is a 3.4 acre indoor Biosphere in Oracle, Arizona that researchers lived in for 2 years and 20 months to see what living on Mars would be like. There are 5 biome areas; a rainforest, ocean, wetlands, savannah grassland, fog desert, and agricultural system. As well as a human habitat.
ADBww TIL: In the 1800s, Mrs Favell Lee Mortimer set out to write an ambitious guide to all the nations on Earth. She had never set foot outside Shropshire. She was horribly misinformed about virtually every topic she turned her attention to. And she was prejudiced against foreigners.
9wALp TIL of pneumoencephalography, a diagnostic procedure used until the 1970s where doctors drained most of the cerebral spinal fluid around the brain and replaced it with oxygen in order to make the brain show up more clearly on an X-ray
v1O4 TIL A man in China used 50 years to hand-carve 6000 steps into the mountainside so that his wife could have an easier walk.
5oWP TIL Neerja Bhanot, an air stewardess on Pan-Am 73 saved 41 American lives by hiding their passports, alerted the flight crew to escape, showed passengers on how to escape and then stayed behind to ensure everyone got off, then died saving three children from the terrorists. A true heroine.