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TIL N95 rating is for the medium particle range

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kJrj7 TIL The bloodiest day in U.S. Military History was June 6, 1944 with 2,500 deaths. (D-day). The bloodiest day for U.S. born soldiers was Sept. 17, 1862 with 3,675 deaths. (Antietam)
m180E TIL that the CUORE Detector located under Gran Sasso uses lead from a Roman shipwreck in its experiments as radioactive-free shielding in its hunt for neutrinos
gMEVA TIL of the 'Merci Train'. 49 box cars sent from France to the US filled with personal items donated by the French people as a 'Thank You' for food & supplies donated to them following WW2. One car was delivered to each state, and many states still have theirs housed in local museums.
yQl8e TIL Generation labels are made up by the marketing industry. Ad agencies wanted another catch-all term for the new members of their target age group. For example, Generation Y was too hard to brand, it didn’t have the spark of “Millennials”. These labels are not based from science.
X0wGr TIL: At least 1/3 of the US Cycling Team in 1984 LA Olympics were doped with a process called "blood doping". The American Cycling team won 9 medals.