 And I'm Chris Houghton. Coming up on As It Happens... Knockout round. Tomorrow, Iranians will vote on whether to vote. They'll decide whether to cast a ballot in the presidential runoff election or boycott it, a decision our guest says is more important than ever. And it's Sen better days. As the Paris Olympics approach, there's a lot of concern about the water quality in the River Sen, but an American visiting the city isn't sure what everyone's freaking out about, so he just jumped in the river to prove to Olympians that it's fine.