GOP presidential candidate Ted Cruz wins the Iowa caucus despite ethanol opposition; what life is like for residents of Porter Ranch during the massive gas leak; and a look at China's last free-flowing river.
Breaking down the billions in Alphabet's earnings report; how lead may be the biggest childhood epidemic in the country; and the latest installment of "I've Always Wondered," looking at what happens when your water goes down the drain.
How the Zika virus is impacting business and travel; schools and children in Flint face the worst of the water crisis; and an interview with GM's Chief Electric Vehicle Engineer about the new Chevy Bolt.
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