The ancestors of ostriches and emus were long-distance fliers. Here's how we worked this out

Aside from being a delight to watch, flight in birds is regarded by many cultures as a symbol of freedom, and a source of ...

A Revolution in Tracking Life on Earth

Across a Swiss meadow and into its forested edges, the drone dragged a jumbo-size cotton swab from a 13-foot tether. Along its path, the moistened swab collected scraps of life: some combination of ...