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TIL that in 1995, scientist Alan S. Waggoner first used fluorescence microscopy to observe DNA behavior in living cells. This technique revolutionized cellular biology by allowing real-time visualization of genetic processes, greatly advancing our understanding of molecular biology.

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b66AE TIL Astronomer Rudolf Wolf tried to estimate pi using a needle experiment. He conducted experiments throwing the needle 5000 times, obtaining a value of 3.1596
Alel TIL that cystic fibrosis patients are strongly encouraged not to get physically close to each other, as doing so can be fatal.
RKew TIL until the enactment of Robin’s Law in 2000, retired military working dogs were routinely euthanized, b/c the dogs were classified as equipment & were thought to be unable to adjust to civilian life. The law is named after a military handler who tried to adopt his dog before it was euthanized.
d06d TIL: Paris only has one stop sign in the entire city!
dZ58 TIL the National Defense Authorization Act for Fiscal Year 2012 essentially repeals the Posse Comitatus Act of 1878 by authorizing the U.S. military to perform law enforcement functions on American soil and makes it very easy for the government to suspend Habeas Corpus - AKA declare martial law.