On May 18, 1910, Halley's Comet transited the Sun's disk, and the Earth actually passed through its tail. At the time, the comet's tail was thought to contain poisonous-levels of cyanogen and gas. The popular media picked up this fact and wove sensational tales of mass cyanide poisoning engulfing the planet. In reality, of course, the gas is so diffuse that the world suffered no ill-effects from the passage through the tail. We have also “survived”: — "The Population Bomb" (although the author's 1968 prediction that hundreds of millions of deaths in the 1980s due to famine didn't come true, he DID sell 2 million books cha-ching!)
Scientists give the reporters the headlines they want. Reporters give the scientists the attention they crave.
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And let us not forget those that control the scientist. They fashion the modern world as they choose, over time.