News

Physics

Neptunium Nukes? Little-studied metal goes critical

Researchers have measured with far greater accuracy than ever before how much neptunium it would take to make a bomb.

Ecosystems

Insects, pollen, seeds travel wildlife corridors

Strips of habitat boost insect movement, plant pollination, and seed dispersal among patches of the same ecosystem.

Paleontology

Trackway site shows dinosaur on the go

Scientists say that a sediment-filled, bathtub-shape depression found at one of North America's most significant dinosaur trackway sites is the first recognized evidence of urination in dinosaurs.

Paleontology

Curved claws hint at pterosaur habits

A study of the claws of flying reptiles known as pterosaurs suggests that some of the creatures may have walked like present-day herons and used their wing fingers to hold prey.