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It is now a year since the UN set its new Sustainable Development Goals to try to make the world a better place. They include 17 goals and no fewer than 169 targets on subjects like disease, education and governance. But some people, such as Bjorn Lomborg, say that they are too broad and too numerous to achieve anything, if left as they are.

There is another chance to hear a special report on the trade in viral video clips. Plus, why do we feel so many different and intense emotions when someone close to us dies? Whether it is yearning, sadness, anger or even shame, Mike Williams explores why each person’s grief is unique when they lose a loved one.

(Photo: A teacher writes on a blackboard during a class in Kenya. Credit: Getty Images)