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TIL that in 1950 US Navy sprayed thought to be harmless bacteria over the SF Bay Area, as an experiment on potential biological attack. It was followed by spikes in cases of very rare urinary infections and pneumonia. Between 1949 and 1969 open-air tests of biological agents were conducted 239 times

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16y1P TIL that SOS is a reverse acronym (a backronym). It is a distinctive and easy way to remember the morse code distress signal of three dots, three dashes, three dots. Only after its implementation did the mnemonic phrase such as "Save Our Souls come into use
yVjwJ TIL, Joan Jett’s famous “I love rock and roll” is a cover
4XbMR TIL that there is no clear meaning behind the title of Umberto Eco's debut novel, "The Name of the Rose". Eco himself once stated that his intention was to find a "totally neutral title", and "because the rose is a symbolic figure so rich in meanings that by now it hardly has any meaning left".
VMgAk Nasa astronaut twins Scott and Mark Kelly no longer genetically identical after space trip.
6EjwZ TIL: although their bodies were badly mangled from the effects of the high altitude / hypersonic orbiter breakup, forensic evidence has revealed that the Columbia Shuttle crew very likely died in seconds from rapid loss of pressure.