By Cat DiStasio
Solutions to some of the world's most challenging problems are coming from an unlikely place: teenagers. Around the world, young inventors are developing gadgets and techniques that address issues ranging from ocean pollution to biofuels to food production. These incredible inventions are just a few highlights from teens who bring a fresh perspective and a hunger for real-life problem-solving. Hopefully, we'll be reading about these young geniuses again years down the road, as they become stars of their own STEM careers.