A longer life. A happier life. A healthier life. Above all, a life that matters—so that when you leave this world, you’ll have changed it for the better. If science said you could have all this just by altering one behavior, would you...

A longer life. A happier life. A healthier life. Above all, a life that matters—so that when you leave this world, you’ll have changed it for the better. If science said you could have all this just by altering one behavior, would you...