Venezuela's opposition tries to win over the military
Venezuela saw more mass protests this week against the government of President Nicolas Maduro. He's in a standoff with National Assembly President Juan Guaido, who declared himself acting president and is calling for new elections. Guaido has been hit with a travel ban and a bank freeze from the Supreme Court. But that hasn't kept his followers from doing all they can to bring down Maduro. We take a closer look.
Also, a massive mudslide slammed through Brazil this week, leaving dozens dead and hundreds missing. The mine was operated by the world's biggest iron ore producer, Vale. The company was also implicated in another burst dam four years ago in the same region that wrought environmental havoc. Experts now say "bigger disasters" could be on the horizon.
And in the US, a polar vortex has brought record low temperatures to some places, making them colder than the Arctic Circle. Many companies have told their workers to stay home, schools have closed and hundreds of flights have been cancelled.