Light is something we use and need every day. It is a form of energy that allows us to see all around us! Lots of different sources produce light. Earth's main source of natural light is the Sun.

The movement of wind and water, the heat and light of the sun, the carbohydrates in plants, and the warmth in the Earth—all are energy sources that can supply our needs in a sustainable way. A variety ...

A Japanese research team has "seen the light" and is utilizing infrared wavelengths to generate electricity, an untapped energy source that accounts for nearly half of solar energy striking the Earth.