It is extraordinary how much information can be learnt by analysing a JPEG in depth: http://t.co/faG13NFsym (image forensics!)
miniblog.
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The npm ecosystem is amazingly broad and deep. I can grab a utility library for choosing a random item from an array, or a part-of-speech tagger for analysing text!
Getting started with Quantified Self projects, looking at ways to measure, leveraging your digital artifacts, and analysing results: https://quantifiedself.com/get-started/
Analysing a load of robots.txt files for a side-project. It's probably not a good idea to put your admin URLs in there.