The first warm-blooded animals appeared abruptly 233 million years ago, according to clues hidden deep inside their ears. Before now, scientists estimated that warm-bloodedness, or endothermy, ...

Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy straightforward explanation. From the jut of the human chin to the curve of the outer ...

These components work together seamlessly to allow us to experience the world of sound. For example, when listening to music, the vibrations travel through the air, enter the ear canal, and cause the ...