Once bathing in the waters of the southwestern United States, a fish, Cyprinodon macularius , found in the Death Valley basement, has surprisingly adapted after the drastic change in its aquatic environment. The adaptation of its metabolism to new conditions is an astonishing example of physiological plasticity.

Senator Harry Reid, the Senate Democratic leader who announced his retirement last week, settled into a corner booth at the Triple George Grill here, his faced masked by dark sunglasses, evidence of lingering injuries from a workout accident that left him blind in one eye.

The University of Nevada, Las Vegas is among 16 locations hoping to host a presidential debate in 2016.