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Meet the data hoarders

If asked to demonstrate how well you know yourself, you might confess to an endearing behavioural quirk or some minor personality kink. But do you know your REM average and glucose levels?

At around the time you’re reading this, more than a hundred data fiends will be gathering in London to share tips on acquiring the kind of numerical self-knowledge that until recently has been the preserve of professional athletes and fitness freaks. The occasion is the 13th “Show & Tell” session of the UK chapter of the “Quantified Self” (QS), a global movement founded in San Francisco five years…

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