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1. How chimp DNA techniques turned us into jungle detectives

   Wild chimpanzees are hard to find, but their DNA – left-behind genetic traces – is opening up a new way of studying them, write experts Alexander Piel and Fiona Stewart

2. Knife crime and gangs: how a decade of bad policy left deprived young people without real choice

   England’s dramatic rise in gang-related knife crime has been called a “disease” by the UK home secretary, Sajid Javid, and amid the daily drama of Brexit the prime minister, Theresa May, has called a summit of 100 experts to Downing Street to discuss the issue.

3. The welcome rise and worrying fall in covert investigation

   Covert techniques and specialist intelligence never appear to be far from the headlines - so why are they on the decline?