More than anything else, Popular Science is a magazine about ideas, and every issue, we try to identify ones that could change the world in ways big and small. Of all our coverage, perhaps no single story better reflects that focus than our annual Year in Ideas feature. In it, we predict the 10 most important concepts for the coming year. Among this issue's standouts, we examine water scarcity in the West, the significance of the upcoming Ceres and Pluto missions, and the rapid development of Ebola vaccines. We also include private space. Next year, NASA, working with Bigelow Aerospace, will begin testing inflatable space habitats, a meaningful step toward the development of a commercial space station. Even with setbacks, powerful ideas only grow.