The World

People are taking to the streets across the globe from Ecuador to Chile to Hong Kong and demanding change. What's going on? Why has the protest movement exploded in 2019, and what makes for an effective protest? And in Turkey, we learn the story of a Kurdish woman who's part of a group of women who have demanded information on the whereabouts of their husbands, fathers and sons for more than 20 years. Also, the silver ants of the Sahara can run their body length in less than a hundredth of a second — 10 times faster than sprinter Usain Bolt. We hear how a researcher was able to measure the ants' speed, and examine why the ants move so fast.