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Science, Tech & Environment

Is an artificial tree part of the solution to climate change? These guys think so.

Trees are nature's tool for pulling carbon dioxide out of the air, but there aren't enough trees in the world to suck up all the CO2 humans are putting there. That's why researchers are pushing to create artificial leaves to help fight climate change. The World's Ari Daniel visits with two teams of researchers pursuing different approaches to the formidable challenge.

Arts, Culture & Media

Saudi singer: People say, 'I hope you die, I hope you burn in hell, you're a slut.'

If you think it's hard to make it as a musician in the US, try Saudi Arabia. Music isn't officially illegal, but many Muslims there believe that music is forbidden — so not only are there no karaoke bars, but shredding that guitar solo might actually get you in trouble with religious police. But that doesn't mean that there are no aspiring Saudi Idols.