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?”

Accounts varied of the Great Famine of 1315–22, during which more than 10 percent of Europe’s population died. In Flanders: “Parents killed their children and children killed parents, and the bodies of executed criminals were eagerly snatched from the gallows.” In France: “There was no wine in the whole kingdom.”

“Pompeii like any other town,” Herman Melville wrote in his journal during an 1867 visit. “Same old humanity. All the same whether one be dead or alive. Pompeii comfortable sermon. Like Pompeii better than Paris.”

Arthur Schopenhauer referred to insurance as “a public sacrifice made on the altar of anxiety.”

In order to halt or slow the advance of glaciers, the Tlingit tribe of the northwest coast of North America used to sacrifice dogs and slaves by throwing them into the glacier’s crevasses in the hopes of appeasing the ice spirit.