Stephen Hawking's black hole fame wasn't his only focus — he also laid out multiple existential threats. Here are five doomsday risks he talked about.
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On the anniversary of Stephen Hawking's death – genius between cosmos and controversy
On this day, March 14, the scientific world not only commemorates one of the most significant physicists of the 20th and early 21st centuries, but also an extraordinary personality: Stephen Hawking.
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