Avocados, green beans, quinoa – it's hard to escape the fact that a lot of what we eat comes in from far-flung places. No longer the preserve of the adventurous minority, shipping or flying food means we can eat what we want all year round. So with more people going vegetarian – or flexitarian – as a more environmentally-friendly alternative to a meat-rich diet, does it actually make a difference? Wayne Martindale goes through the big factors that influence the answer.

Usain Bolt is to lose one of his nine Olympic gold medals after a Jamaican team-mate in the 4x100m relay, Nesta Carter, tested positive for the banned substance methylhexaneamine. But what is this strange molecule which originally was formulated in a lab as a nasal decongestant? Simon Cotton decodes the chemistry.

Mel Gibson’s latest film, Hacksaw Ridge, tells the story of Desmond Doss, a religious pacifist who became a US Army medic during World War II. Unfortunately, instead of making a compelling case for peace, says Guy Westwell, the film actually reinforces a jingoistic political culture in a time of grave global danger.

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