In the 1970s, a new breed of American man emerged from the weight rooms of Gold’s Gym in Venice Beach. Led by Arnold Schwarzenegger, a clique of world-class bodybuilders — muscle-bound, steroid-fueled, bronzed like suntanned gods — pumped iron, chased girls, and changed the world’s exercise culture forever.

Steelers linebacker James Harrison has been labeled the scourge of football — a one-man concussion machine. But he says he plays the game the way it’s meant to be played, and he doesn’t care what anyone thinks — especially the commissioner.

If you think global warming is some distant threat, come visit Yellowstone, our most beloved national park. Acres of trees are dying, trout runs are disappearing, and starving bears are attacking campers. It’s an ecosystem in collapse, and things are only getting worse.

Buck Showalter has an obsessive mind for the game. That’s been both his greatest strength — and his undoing.

For a long time, juicing was my elixir. It got me bigger. It got me stronger. It got me laid. But that was before it nearly got me killed.

They return seemingly intact but beset by fierce migraines and sleepless nights, unable to complete the most basic tasks. It’s an epidemic not seen in previous wars — tens of thousands of soldiers afflicted with a brain condition caused by repeated exposure to blasts. And the military has done little to help them.

Born with a rare syndrome that left him profoundly autistic, seven-year-old Luke was trapped in his own body. But then his dad took him surfing.

Cheap, easy to make and instantly addictive, crystal meth is burning a hole through rural America. A hellish tour of a home-cooked drug crisis...