Chronic Fatigue Syndrome (CFS) sufferers describe symptoms of severe exhaustion, weakness, muscle pain and fatigue. But why, and what is science revealing about the underlying causes of the condition? We talk to a researcher who is probing the genetic links to the syndrome, a clinician with evidence that the muscles of patients accumulate acid when they exercise and a pathologist with post-mortem evidence of inflammation in the nervous systems of CFS sufferers. Also, in the news this week, the ants that help a pitcher plant to catch its lunch, the missile-hurling zoo chimp who plans his... Like this podcast? Please help us by supporting the Naked Scientists

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