In 12 years, the world will welcome its eight-billionth person, and that child will inherit a planet that is hotter, drier and more crowded. Science is racing to make the Earth a better place, from reducing reliance on fossil fuels with cars that run on air, to alternate sources of energy, like the Canadian engineer who wants to harness the power of man-made tornados. Geoengineers propose ways to cool down the Earth in a hurry. 3D printing will revolutionize manufacturing, and graphene, only one atom thick, will be the new plastic. 50 Mind-Blowing Discoveries That Will Change the World includes photo galleries, videos and interviews with scientists and innovators explaining everything from dark matter to one man’s plan to start a colony on Mars.