In Brazil, a sleepy southern town is home to a fertility phenomenon: it holds the curious record for having the most twins in the world, ten times the global average. Theories abound as to why. Is it down to a genetic mutation reinforced over years of relative isolation? Or could something more sinister be afoot? Haxie Meyers-Belkin takes a look. Also on the show: since Hurricane Harvey first hit, a series of sensational images have gone viral. Catherine Bennett from our Observers desk helps us to separate the real from the fake. You can find out more in this article from the FRANCE 24 Observers team.

And a new political crisis hits Guatemala, as the president's attempt to kick a UN official out of the country sparks protests.