For years, solar power at home was mostly limited to people who own their rooftops and could afford the steep upfront costs. But a new generation of small, affordable systems are making clean energy more accessible. The technology, often called "plug-in" solar, is already widespread in Germany and gaining momentum in the United States. KQED's Laura Klivans reports. | PBS NewsHour

Facts About the Solar System: Lesson for Kids

What is Solar Radiation? - Lesson for Kids