COVER STORY This issue: Every coral Counts. RESEARCHERS ARE RACING TO SAVE THE WORLD’S REEFS. Coral reefs are home to 1 in 4 ocean species, support fisheries, and protect coastlines from storm surges and rising sea levels. And they are at risk. Last fall, scientists reported that warm-water coral reefs are passing their planetary tipping point, a threshold that, once crossed, leads to large, accelerating, and often irreversible changes….To understand the world we live in, read TIME.

Life once followed a familiar pattern. You’d go to school, get a job, build a family, and then, sometime in your 60s, retire, enjoying life for a few years until you grew too frail to live on your own. Then you might move in with family or check into a facility where you’d spend your “golden years”. A crucial part of that blueprint was an unsaid but universal assumption: that for the vast majority of people, life would not extend far beyond their 70s. That was based on the average lifespan when this still dominant picture of an American life arc…

HOW HUMANOID ROBOTS COULD TRANSFORM MODERN WARFARE—The Phantom MK-1 looks the part of an ai soldier. Encased in jet black steel with a tinted glass visor, it conjures a visceral dread far beyond what may be evoked by your typical humanoid robot. And on this late February morning, it brandishes assorted high-powered weaponry: a revolver, pistol, shotgun, and replica of an M-16 rifle.“We think there’s a moral imperative to put these robots into war instead of soldiers,”…