One day I’m sure everyone will routinely collect all sorts of data about themselves. But because I’ve been interested in data for a very long time, I started doing this long ago. I actually assumed lots of other people were doing it too, but apparently they were not. And so now I have what is probably one of the world’s largest collections of personal data. Every day—in an effort at “self awarenes
QR codes (short for Quick Response Codes) were invented in 1994, by the DENSO Corporation. I'm sure you've seen lots of them. They are the natural progression of bar codes. Bar codes are one dimensional, encoding data in a series of alternating high contrast lines. QR codes store data in two dimensions in the form of an array of contrasting regions. The information density of a QR code is much hig
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