Professor James Logan leads an internationally renowned research program at the London School of Hygiene and Tropical Medicine, presents television programs and has a passion for science and natural history.
With a team of engineers, Paul Moller works on the Skycar, a combination car and jet, as well as the M200, a saucer-shaped hovering car. He also develops next-generation engines to power these and other amazing vehicles.
As the CEO of Public Radio International, Alisa Miller works to bring the most significant news stories to millions -- empowering Americans with the knowledge to make choices in an interconnected world.
Ernest Madu founded the Heart Institute of the Caribbean, a revolutionary clinic for cardiovascular diseases in Kingston, Jamaica -- revolutionary for offering first-class health care in a developing nation. His next stop: Nigeria.
Bono, the lead singer of U2, uses his celebrity to fight for social justice worldwide: to end hunger, poverty and disease, especially in Africa. His nonprofit ONE raises awareness via media, policy and calls to action.
David Heymann is a professor of infectious disease epidemiology at the London School of Hygiene and Tropical Medicine. He led the World Health Organization's global response to the SARS epidemic in 2003.
To power his family's home, young William Kamkwamba built an electricity-producing windmill from spare parts and scrap -- starting him on a journey detailed in the book and film "The Boy Who Harnessed the Wind."