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Pools in the Mexican desert are a window into Earth’s early life
Rodrigo Pérez Ortega Valeria Souza Saldívar never planned to devote her life to a remote and ancient oasis more than 1000 kilometers north of her laboratory in Mexico City. But a call in early 1999 changed that.“It’s one of the best cold calls I’ve ever made,” says James Elser, a limnologist at the University of Montana.