A new study of fossil footprints in White Sands National Park bolsters the argument that humans may have lived in North America longer than thought.

Archaeologists dug into a riverbank in Zambia and uncovered what they call the earliest known wood construction by humans. The half-million year-old artifacts could change how we see Stone-Age people.

Scientists have found a cluster of rhythmic brain cells in newborn mice that may explain why spoken languages around the world share a common tempo.