This week, thousands of students and activists marched across the United States, calling for tighter gun control and the repeal of the second amendment, which protects the right for people to bear arms. But it was a call that President Donald Trump quickly rejected. At the heart of the pro-gun lobby is the infamous National Rifle Association (NRA). We have taken a closer look at the links between the NRA and many of America's top politicians. And as the Facebook data sharing scandal snowballs, we also meet the whistleblower who leaked the story. Christopher Wylie says data from some 50 million users was improperly harvested via an app.

Finally, we head to Chile, where avocados are considered "green gold". We take a look at the devastating effects the thriving business has had on the country's water supply.