Kirk Sorensen stumbled across thorium while doing research on how to power a lunar community. Thorium is a cleaner, safer, and more abundant nuclear fuel -- one that Kirk believes will revolutionize how we produce our energy.
TED Prize winner Larry Brilliant has spent his career solving the ills of today -- from overseeing the last smallpox cases to saving millions from blindness -- and building technologies of the future. Now, as Chair of the Skoll Global Threats Fund, he's redefining how we solve the world's biggest problems.
As computer access expands, Mikko Hypponen asks: What's the next killer virus, and will the world be able to cope with it? And also: How can we protect digital privacy in the age of government surveillance?