Millions of students returned to campus this fall for the in-person college experience, as the delta variant continues to impact parts of the U.S. Some schools have strict mandates for vaccination, testing and masking. In other places, that’s not an option. Hari Sreenivasan begins the latest in our “Rethinking College” series at two of America’s flagship universities.

A fifth of world population is affected; many U.S. cities on list.

Despite its controversial past, the quirky desert facility is becoming increasingly relevant as it turns 30

According to Wahid Bhat, climate change is the defining crisis of our time and it is happening even more quickly than we feared. But we are far from powerless in the face of this global threat. No corner of the globe is immune from the devastating consequences of climate change. Rising temperatures are fueling environmental degradation, natural disasters, weather extremes, food and water insecurity, economic disruption.

The Bannister Building looks distinct among the typical red-brick buildings on campus, yet students walking by, preoccupied by their phones and classes, fail to notice the 40-foot-long steel columns suspended from the building. 

Walmart heirs have spent heavily to promote their view that water markets are the best way to deal with a dwindling supply.

New projections show that Lake Mead and Lake Powell could reach “critically low reservoir elevations” sooner than expected, spurring experts to say that “bold actions” will be needed to change course.