Are we alone? It's one of the most basic questions of human existence. People have been trying to answer it for millennia in ...

Even the most elite endurance athletes can’t outrun biology. A new study finds that humans hit a metabolic ceiling at about 2.5 times their resting energy burn. When ultra-runners take on races that ...

The dark blue circles on the left side of the graph show the direct measurements of calorie burn during training and racing.

A new study reveals a metabolic ceiling - an upper limit to how much energy the human body can sustain over time, no matter ...

Attorney General Pamela Bondi on Monday defended a controversial Trump administration proposal to eliminate the ATF and merge its functions into the Drug Enforcement Administration. The plan, outlined ...