The mysteries of earth’s core

“I’m one of those wacky wild swimmers,” he says. “Rain or shine, summer or winter, regardless of what country I’m in, I try and find someplace.” To justify the appeal, he draws on nature writer Roger

THE MOST DOMINANT FORCE IN THE UNIVERSE IS ALSO ITS MOST MYSTERIOUS AND MOST UNANTICIPATED

Were the seeds of Civil War already written into the American Constitution?

The land Down Under seems ready-made for soul-stirring adventures. Its 16,000 miles of coastline are one long playground, with vertiginous cliffs riddled with hiking trails and reefs ripe for diving. There’s ancient flora and unique wildlife hiding in the rainforests, and cities that offer every activity under the sun. So pick up your hiking boots, paddle or flippers and get outdoors

From dark matter to deep-sea crabs, science still can’t fully explain these strange quirks of nature

TEERAYUT CHAISARN/GETTY AMBULATORY SURGERY CENTERS CONTINUE to ...