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TIL that after discovering radio waves, Heinrich Hertz was asked about the practical applications of his discovery. He replied, “Nothing, I guess.” He died at age 36, shortly before the first successful demonstration of radio.

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gMyEW TIL that software bugs in a radiation therapy machine were responsible for killing 3 people with high doses of radiation
R5gkj TIL that the US Air Force has never drafted anyone into service and is the only branch to never use conscripts
lok6B TIL In the 1960s, to keep the workforce fresh-faced and energetic, flight attendants were expected to retire by age 32.
9YbX7 TIL Baader Planetarium in Germany manufactures a filter film for safe viewing of the sun. This precision film was made in laboratories for nuclear and particle physic and its reflective property reduces intensity of sunlight by over 99.999%. The Sun appears in its real color - neutral white
dBb9 TIL in 1952 Kent sold cigarettes with an asbestos filter claiming it was healthier than regular smoking