Topic: Bill & Melinda Gates Foundation

Change Agent Using Hollywood to teach people about disaster giving

Mike Rea latched onto the release of a Hollywood film on the 2004 tsunamis in Asia to help spread his message about how to effectively support charities engaged in disaster relief.

Top 10 richest Americans

Ghana's best shot at going green: sewage power

Change Agent 'Parent power' film stirs hopes among education reform activists

Change Agent Southeast Asian scientists look to reinvent the flush toilet

Change Agent Cash rewards spur poor communities to pay for sanitation projects

Change Agent A lab uses remote sensors to measure how well aid projects work

Toilet of the future? Runs on sun. Wins prize.

Back to school: How to measure a good teacher

Change Agent Why resilience is the key to solving 21st century problems

Change Agent University of the People offers low-cost college courses via the Internet

Report: Ethiopians could still go hungry despite economic gains

The Masters: 12 women candidates for Augusta National membership

Change Agent Bloomberg donates $220 million to anti-smoking efforts worldwide

Green Economics Downton Abbey and the kinder, gentler 1 percent

Opinion Eight ingredients for a peaceful society

Ending malaria: How genetically modified mosquitoes could unlock Africa's wealth

Good Reads: On World AIDS Day, global relief funding stalls

Climate change and chocolate

In Pictures The world's richest people

On remote Tibetan plateau, a health-care program that could be a model for China

Warren Buffett gives $1.5B in stock to Gates Foundation

America's biggest teacher and principal cheating scandal unfolds in Atlanta

How is social media revolutionizing Africa?

Human waste could be biofuel