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Humans can be tracked with unique 'fingerprint' based on how their bodies block Wi-Fi signals
(www.theregister.com)
This is a most excellent place for technology news and articles.
First - someone comes up with this. Next, privacy researchers and black/white/grey hat techies come up with methods to defeat it.
Better for surveillance tech research like this to be published out in the open than developed in some secret lab. I figure these researchers are doing more positive than negative by publishing their findings. It's not like if they didn't publish, someone else wouldn't come up with this and possibly use it clandestinely.