Andrew Rossi, a paleo technician, works on a fossil at the Wyoming Dinosaur Center in Thermopolis, Wyo.
Andrew Rossi, a paleo technician, works on a fossil at the Wyoming Dinosaur Center in Thermopolis, Wyo. Steve Johnson for The Washington Post
Andrew Rossi, a paleo technician, works on a fossil at the Wyoming Dinosaur Center in Thermopolis, Wyo. Steve Johnson for The Washington Post