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A new paper looks into exactly what the act of making a phone call can reveal. The study, which was led by Patrick Mutchler and Jonathan Mayer at Stanford University in the States, is the culmination of work looking into what metadata really can show - you may have seen reports of some of their findings, as they've been revealing them in the public interest since 2013. They collected metadata volunteered by 823 participants, in total, more than 250,000 calls, and 1 million text messages. Stephen Murdoch from the Information Security Research Group at University College London joined Dr Adam Rutherford to put this into context. First broadcast on Â鶹Éç Inside Science, 19 May 2016.