The president is betting that harnessing the power of the sun will decrease the cost of the wall.
The experimental aircraft landed in Seville on Thursday morning.
While Corey Lewandowski was battling against taxpayer-funded green-energy projects, he privately sought funds for a solar power company.
The moves are part of Obama's "broader vision" for ameliorating the effects of climate change.
If saving the planet doesn’t make you switch to solar, maybe the price will.
Designers in the Netherlands have built a bike path that generates solar power.
From lighting your television screen to sterilizing polluted water, how the new Nobel laureates’ inventions can change the world