In this week's show, wildfires continue to race across the world in Canada, Ireland, Scotland and Italy. Why are they happening, and what can we do to prevent them? Plus, scientists track neighbourhood food consumption from DNA in sewage, the first evidence of an "exomoon" orbiting a planet outside our solar system, and how tiny "algebots" can deliver cancer chemotherapy in the bladder. What makes these critters remote-controlled? Like this podcast? Please help us by supporting the Naked Scientists

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