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You've been too busy splashing about having fun to focus on your bladder. Sure enough, by the time you realise you're in desperate need of a toilet, it's too late. There's no way you'll make it there in time. So, do you just discreetly wee in the pool? If so, researchers in Canada, say you're not alone. They've figured out just how much pee is in the average swimming pool. Lovely. Via Newsbeat.