Trump approves TikTok deal. But big questions remain

(CNN) -- Who controls TikTok? Is the social media platform safe? Has a US ban been averted for good? President Donald Trump's attempts to force a quick sale of popular Chinese-owned video app TikTok produced a tentative deal over the weekend that would see…

The 15 cities investing the most in solar energy

The U.S. solar industry has grown significantly in the last decade as solar power has become more affordable, efficient, and accessible. Not surprisingly, solar energy use and investment varies considerably across cities.