I've just found out that I'm on Google Earth. The first thought that crossed my mind was that I know I've put on a few pounds over the years, but not so many as to be visible from space surely? Actually, my picture was taken by the Google Maps Street View Car as it was making its way through Bristol last summer. They have a picture of me taking a picture of them so I guess we are even.
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Thanks to Talkie Tim for letting me know about this.