This rainforest tree solved one of evolution’s hardest problems. Here’s how it evolved to use tension and geometry to fire ...

Adolescents are known for risky behavior, with teenagers in the U.S. more likely than younger children to die from injury.

The hollowed-out trunk of the ancient yellow cedar felt like a cocoon with its soft floor of bark strips. A mother bear had molded this bed when she came each year to hibernate and to birth her cubs ...