Numbers are a powerful way of strengthening a message - and when we see a statistic that backs up a strongly-held belief, it can be very easy to share it without thinking too much about it. But all statistics benefit from a quick check before use - and it's doubly important to do so when they tell us what we want to hear. A couple of days ago, I saw this message on a friend's social media. (I've removed the name at the top and added the words in red - otherwise it is unchanged.) The message is stark. But a couple of things worried me about it. Firstly, that subscript of 'Bristol for Europe' seemed a bit odd. It's clearly not part of the original post, and how exactly could the information come from both the BBC and a pressure group? But more importantly, the exchange rates quoted didn't feel right. I was sure sterling suffered as a result of Brexit (or, rather, BREXIT - being shouty is another flag that checking of data is required) - but a change like this ...