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TIL the difference between a biotechnology company and a pharmaceutical company – both produce medicines, but a biotech’s medicines have a biological basis, and a pharmaceutical’s medicines have a chemical basis.

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Obba TIL that in order to transmit radio signals to submerged submarines, one technique is to place electrodes in the ground many miles apart, using the earth’s core as a giant antenna.
6ERKY TIL the first "Made in <Country>" label was created in 1887 in England to discourage foreign goods and to encourage consumption of domestic-made goods; this ultimately backfired when Britons bought more goods made in Germany than domestic made ones
9YeKQ TIL, women considered lower-caste in Kerala (India) had to pay Breast Tax (Mulakaram) for covering their breasts in public, otherwise go topless in public (until 1924)
94Dm TIL the vibrator was “the fifth domestic appliance to be electrified, after the sewing machine, fan, tea kettle, and toaster, and about a decade before the vacuum cleaner and electric iron.”
VBAK0 TIL: The trousers of the British Royal Air Force WWIl uniforms had two buttons that served as a compass when put together.