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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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Z8yPY TIL that a holocaust denial group offered $50,000 to anyone who could prove that gas chambers were used to intentionally kill people at Auschwitz. They were forced by a judge to pay that money, and an additional $40,000, to Auschwitz survivor Mel Mermelstein who provided proof of that very fact.
W7oZL TIL The Clay Mathematic Foundation offers 1 million dollars to anyone to solve this equation. The Riemann Hypothesis. σ (n) ≤ Hn +ln (Hn)eHn
woJr7 TIL Japanese artist Hitomi Terasawa drew the inner workings of the Kowloon Walled City before it was razed in 1994
mbOx TIL that Lake Kivu is one of three lakes that undergoes limnic eruptions. These sudden releases of carbon dioxide kill every human and animal around the lake. It is estimated that the lake erupts about once every thousand years. Currently, about two million people live on the shores of Lake Kivu.
E1oO7 TIL nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making radiocarbon dating after 1945 likely to be unreliable.