Hormones follow natural rhythms that rise and fall throughout the day. These rhythms depend strongly on the light your body receives. Sunlight regulates your sleep cycle, reproductive hormones and ...

This activity is part of the Science Friday Sun Camp collection! For 4.5 billion years, the Sun has generated energy to power the solar system. Visible light is the most obvious form of that energy.

Solar lights can seem like magic. They turn the light from the sun into usable electricity, making for beautiful garden lighting that's totally free to run. But how do they actually work? I spoke to ...

If you worked in a dingy, windowless environment, it would be nice (and energy-efficient) if you could get natural daylight "piped in" from outside. An experimental device does exactly that, in a new ...