By now the numbers are as familiar as they are scary: Today's kids spend an average of seven hours a day in front of screens. That behavior has been linked to higher rates of obesity, lack of sleep, behavioral issues, and poorer social skills. The cure? Nature. Kids who spend time in wilderness benefit from reduced stress and better health, creativity, learning ability, emotional intelligence, and problem solving. But you don't have to tell the kids that. This summer, simply tell them what parents have been saying for ages: Go play outside.