According to sixth-century-bc Greek poet Hipponax of Colophon, in times of drought, famine, or plague an ugly or deformed person was chosen by the community to be pharmakós, or scapegoat. After being fed figs, barley cake, and cheese, he would be struck on the genitals with the bulbs and twigs of wild plants, led on a procession accompanied by flute, and burned on a pyre. His ashes were thrown into the sea. It is believed that Hipponax, whom Pliny the Elder once called “notoriously ugly,” may have been exaggerating the ritual.

The opening of a particle accelerator at Brookhaven National Laboratory in 2000 inspired fears that high-speed collisions might launch a chain reaction that could turn the earth into a hyperdense sphere about one hundred meters across. A risk calculation determined this to be unlikely; if the collider were to run for ten years, the chance was no greater than 1 in 50 million. “The word unlikely, however many times it is repeated,” wrote concerned scientists, “just isn’t enough to assuage our fears of this total disaster.”

Astrologers of the Ayyubid Empire predicted in 1186 that the world would end September 16 of that year; a dust storm, stirred up by planetary alignment, would scour the earth of life. Sultan Saladin criticized the “feeble minds” of believers and planned an open-air, candlelit party for that evening. “We never saw a night as calm as that,” an attendee later remarked.

Hatches of Rocky Mountain locusts (Melanoplus spretus) in 1874 and 1875 brought swarms up to 1,800 miles long and 110 miles wide across the Great Plains. Numbers were estimated in the trillions. Farmers risked starvation. The swarm is believed to have been the largest mass of living insects ever witnessed by modern man—but within thirty years the species disappeared. “I can’t believe M. spretus is extinct,” said ecologist Dan Otte in 2014. “But where to look for it?”

Sixteenth-century “father of mineralogy” Georgius Agricola critiqued “these attacks, which are so annoying,” made by those protesting how mining exterminated animals and poisoned brooks and streams. “With the metals that are melted from the ore,” he explained, “birds without number, edible beasts, and fish can be purchased elsewhere and brought to these mountainous regions.”