Thinking the Unthinkable

Rare cataclysms are hard to study and plan for, but they may be too dangerous to ignore. Read the full story in Science magazine and listen to my interview on the Science podcast.

The long, bitter debate over Meteor Crater

Long before Arizona’s Meteor Crater got its name, scientists puzzled over its origin. Grove Gilbert, a well-respected figure at the US Geological Survey, thought a steam explosion had hollowed out the vast bowl of desert, while a scientific outsider named Daniel Barringer insisted that an impact had blasted it out. It took more than half … More The long, bitter debate over Meteor Crater