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TIL that 70% isopropyl alcohol is more effective than higher concentrations

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kW11 TIL: The city of Los Angeles is the 3rd most productive oil field in the U.S., but most of the oil wells are camouflaged inside of fake office buildings and even sculptures.
RdE9 TIL that in 1907 a medical doctor tried to prove the existence of the human soul by weighing people at the moment of their death.
Y71MA TIL Jacques Lusseyran went blind at age 7. At age 14, alarmed by the Nazi's rise to power, he learned German to understand Hitlers speeches. At age 17 he was leader in the French resistance, and was sent to Buchenwald concentration camp. He was among the 990 out of 2000 French prisoners to survive.
lrDG TIL when filming Breaking Bad, Cranston got the pizza on the roof in the first take.
9Yv8D TIL that in the late Middle Ages, books were so valuable that libraries would chain them to the bookcase. This was widely practised until the 18th century.