Study finds just the smell of stress in humans can change a dog’s behaviour. Researcher explains ‘amazing’ similarities between chimpanzee and human conversations. London police officer quits after calling 999 while high on magic mushrooms. Also in this episode:

• Dr Gal Badihi explains chimp & human conversational similarities
• ‘Dark oxygen’ produced by metals on deep-ocean floor, study finds
• Mobile carriers banned from hiking prices mid-contract based on inflation
• Blood proteins predict risk of developing more than 60 diseases – study
• Male elephants use deep rumbles to signal when it is time to go

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