The collapse of the world’s second-largest ice sheet would drown cities worldwide. Is that ice more vulnerable than we know?

Inside this double issue of SciAm, you’ll find black holes that burp up their stellar meals, metal detectorists that hit pay ...

From a distance they look almost like ordinary sailboats, their sails emblazoned with the red-and-white flag of Denmark. But these 10-meter (30-foot) -long vessels carry no crew and are designed for ...