News

Animals

Dinosaur debate gets cooking

A key piece of evidence for cold-blooded dinosaurs, growth lines in bones, has also been discovered in a set of warm-blooded animals.

Health & Medicine

Male contraceptive shows promise

Two hormones in gels applied to the skin effectively lower sperm counts, a study finds.

Humans

Lead poisoning stymies condor recovery

California’s iconic comeback species may need human help as long as even a small percentage of the carcasses they eat contain lead shot.

Physics

Old battery gets a high-tech makeover

Redesigned nickel-iron battery gives modern lithium-ion devices a run for their money.