Filip Hammaréus, PhD student, and Petter Dyverfeldt, professor, at Linköping University. The research was performed at the Center for Medical Image Science and Visualization in Linköping, Sweden.

Water flow is at an all-time low at Quitobaquito Springs, a culturally vital oasis home to two endangered species next to the U.S.-Mexico border. Dusk falls on the pond at Quitobaquito Springs, in ...