Forewarned: A Warning Written in Fire

Something struck the Earth 12,900 years ago — not once, but in a swarm, delivering the force of hundreds of nuclear weapons across multiple continents in the span of hours. There is no crater. There didn't need to be. The evidence survives instead in a thin dark line of scorched earth found from Patagonia to Greenland, in glass melted at temperatures no wildfire or volcano can produce, in the bone...