› added 9 months ago

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TIL that photosynthesis doesn't recycle CO₂ into oxygen, the oxygen actually comes from water. Plants break down water (H₂O) to consume the hydrogen necessary to make sugar, and release the oxygen. The CO₂ is never broken down, plants just use it as a building block to make larger carbon compounds.

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9DQ7 TIL that from 1952 to 1956, billions of Kent Micronite cigarettes were sold with a filter made from asbestos. The new filter was marketed as “the greatest health protection in cigarette history.”
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