How We Found the Dinosaur Doomsday Site

On March 22, 1991, David Kring stood at a podium at the Lunar and Planetary Science Conference in Houston and revealed the exact location of the most important impact event in the past 100 million years. The dinosaur-killing space-rock struck Mexico’s present-day Yucatan Peninsula near the town of Chicxulub.

By that time, most geologists already accepted Luis and Walter Alvarez’s once-wild theory that a 65-million-year-old, worldwide layer of iridium — a material common in asteroids, but

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