Steve Caplin says a robot dog can now play badminton – as well as a 7-year-old. Mobile phone conversations can be picked up by radar, with limitations. After a trial, 3,500 solar-powered postboxes which accept parcels are being rolled out. The Guinness Book of Records is 70 years old; Steve tells us his favourites. The African Union is complaining that Mercator maps skew the size of land masses. There's a website that will show you proper country comparisons. And scientists have found a way to transplant behaviour – in fruit flies.

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