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Animals

Male birds’ sexy songs may not advertise their brains after all

A biologist backs off an idea he studied for years that the mastery of birdsong is a sign of bird smarts.

Health & Medicine

Lack of sleep is tied to increases in two Alzheimer’s proteins

In people and mice deprived of sleep, researchers found an increase in tau, a protein involved in Alzheimer’s disease, in the fluid bathing the brain.

Neuroscience

Rocking puts adults to sleep faster and makes slumber deeper

People sleep better when their beds are gently rocked, a small study finds.

Paleontology

Tiny eyes make a bizarre, ancient platypus-like reptile even weirder

An ancient oddball marine reptile had teeny-tiny eyes, suggesting it probably used senses other than sight to catch food.