Kevin Mwachiro from Mombasa, Kenya wants to know.
An epic solar car race has begun in Australia, with vehicles crossing the country's tropical north to its southern shores. The World Solar Challenge aims to showcase technology that could be used for commercial purposes.
A former prison inmate and gang member is among hundreds in Los Angeles to find a place in the sun - and a second chance - via a solar industry re-entry program.
Rainbows aren't just pretty, they're also cool examples of science at work, a symbol for the LGBT movement and - as some believe - a bridge to the world of the Norse gods.
In Morocco, a big new solar-powered plant for turning seawater into drinking water is being built. Is the business case for renewable-energy-powered desalination technology becoming strong enough to unleash a boom?
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