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TIL: In 1990s, some Chinese villages grew economically by widespread selling of blood, leading to many HIV deaths

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kOv7W TIL the Copyright Term Extension Act (CTEA) of 1998 expires on New Years Day, 2019, finally allowing works to become part of public domain, starting with works published in 1923.
9bdQ TIL that the windshield of the SR-71 Blackbird can reach a temperature of over 600°F during flights at mach 3. It had to be made of quartz and was ultrasonically fused to the titanium hull in order to handle the stress.
OGBne TIL that there is no specific date for when the office of prime minister of the UK first appeared, as the role was not created but rather evolved over a period of time through a merger of duties.
eJa4 TIL that out of 18,400 men, women and children in the Witness Protection Program, there aren’t any that have been harmed.
Oo6b7 TIL the Statue of Liberty's sandals are 25 feet long, making her shoe size 879.