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Testing for cervical cancer with a drop of vinegar could provide low-cost screening in developing countries where only 5% of women have smear tests. Interview with Brian Greene, whose book The Elegant Universe about superstring theroy – a unified way of understanding matter, time and space – is a bestseller. The programme's happy pill debate continues. The vocal Madagascan tree frog that has 28 different calls – more than any other amphibian.