Natural Wonders

The Okavango Delta Floods When the Surrounding Land Turns Dry

In Botswana, floodwater from distant rains spreads across a desert delta months later—creating a seasonal wetland that supports an extraordinary…

Death Valley’s Sailing Stones: How Wind and Thin Ice Move Rocks Across a Desert

At Racetrack Playa, rocks leave long trails across a dry lakebed. Researchers finally watched the unlikely combination of water, ice…