Going back to hardware days.
Getting myself an RFID reader to start playing with cards, tracking and the corresponding software.
Expensive stuff - will get a cheaper one:
http://www.alibaba.com/product-gs/510277926/13_56Mhz_NFC_RFID_reader_factory.html
- Tracking people
- Tracking things
- Tracking things that appear with other things, or with people
- Tracking flows of things across places.
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