Subdermal RFID chips have been on the market <a href='http://edition.cnn.com/2004/WORLD/europe/06/09/spain.club/'>for a while</a>. Now, they can hold a lot more data than ever before, and could replace your <a href='http://www.geekwire.com/2013/xnt-implantable-nfc-chip/' target='_blank'>smartphone and tablet passwords</a>.
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