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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.
I hate it when commercials say "up to 100%." It's literally a pointless metric; that could mean anything from 0% to 100%, inclusive.
edit: Closed quote.