At the very beginning of its history, Earth was dry. How did it become a blue planet? A new theory could provide an answer.

As a result, they have developed a material that leverages sunlight to separate hydrogen from water, OSU reported ... is primarily used to make hydrogen through a process called steam-methane ...

In one technique, long troughs of U-shaped mirrors focus sunlight on a pipe of oil that runs through the middle. The hot oil then boils water for electricity generation. Another technique uses ...