Long-buried traces of Denisovan DNA have resurfaced in modern human genomes — and they may still be working for us today.

Mountain lions are one of North America’s most beautiful feline predators. These big cats are known by many names, including cougar, puma, and panther. Mountain lions survive on stealth, roaming an ...

Although the science is unsettled, the White House has embraced core tenets of the ‘sperm count decline hypothesis.’ ...