The Quest: Energy, Security, and the Remaking of the Modern World by Daniel Yergin

Zambia still faces big challenges, but Bill Gates returned from a recent trip there excited about the progress he saw there eliminating malaria and reducing the spread of HIV/AIDS.

In this video clip, Bill Gates shows Ethiopia’s extraordinary new health infrastructure, which includes 15,000 Health Posts providing easy access to basic health services for mothers and children.

Despite a history of famine and disease, Ethiopia is on the leading edge of advances in agriculture and health that could serve as a model for the rest of Africa.

Ping-pong, newspaper tossing contests, and a five-hour question-and-answer session with Warren Buffett were highlights at this year’s Berkshire Hathaway meeting in Omaha.

Bill Gates marks World Malaria Day, a time to assess progress against the disease, prospects for a vaccine, and the possibility of eradication.

Immunization prevents deaths every year in all age groups from diphtheria, tetanus, pertussis (whooping cough), and measles. It is one of the most successful and cost-effective public health interventions.

How to meet the growing energy needs of the world’s two billion poorest people? Bill talks with energy expert Daniel Yergin.

Can nuclear power help meet the world's growing energy needs while reducing carbon emissions? Bill Gates talks with energy expert Daniel Yergin.

Bill discusses how innovations are saving and improving lives in Africa - and how you could win a $100,000 grant from the Gates Foundation for your own world-changing idea.