Yellow jerseys of the fireline: A day fighting wildfires can require as much endurance as riding the Tour de France

For three weeks in July, the world's most elite bike racers climb steep mountains and sprint along historic cobblestones to capture the coveted yellow jersey or the race leader in the Tour de France. It's a 22-day feat of human endurance that requires constant eating and drinking to manage the average daily energy demand of about 6,000 calories, equivalent to around 12 McDonald's Happy Meals, and just over 1.5 gallons of water.