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TIL about John Buettner-Janusch, a professor that went to jail twice; first for for manufacturing LSD, and second time for trying to poison the judge

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yVoVv TIL about Mary Louvestre; an African-American Civil War spy who delivered details about the construction of the Confederacy's first ironclad into Union hands by tracing plans her employer had using her seamstress skills.
Bg7yd TIL that there is little to no scientific evidence that probiotics reduce gastrointestinal discomfort, improve immune health, or relieving constipation. Both US and EU regulators have rejected claims by companies claiming such benefits.
konE TIL that in the 50’s and 60’s the CIA would hire prostitutes to bring back unsuspecting men to safe houses where they would be drugged with large doses of LSD and observed from behind a one-way mirror. It was dubbed Operation Midnight Climax.
oBp9K TIL some humans can see some frequencies of ultraviolet light, with it appearing as a whitish-blue or violet. This is because they have no lens in their eye, due to surgical removal.
PDyJ TIL Sunscreen SPF is a very nonlinear metric. An SPF of 15 blocks 93% of incoming radiation, SPF 30 blocks 97%. SPF 50 blocks only 1% more than SPF 30, at 98%.