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Life

Sparkly exoskeletons may help camouflage beetles from predators

Iridescence, normally thought to help insects stand out, can also camouflage beetles from predators, according to new experimental evidence.

Archaeology

Mount Vesuvius may have suffocated, not vaporized, some victims

A new study suggests people living near Pompeii who hid in stone boathouses died a slower death when the volcano erupted in A.D. 79.

Humans

Stress turns hair gray by triggering the body’s fight-or-flight response

A study in mice finds stress responses deplete cells that give hair its pigment, making the strand white.

Earth

Fed by human-caused erosion, many river deltas are growing

Deforestation and river damming are changing the shape of river deltas around the globe.