Many people (somewhere between 30,000 and 50,000) have chosen to use tiny implants instead of normal keys or identification. The implants are inserted into fatty tissue and, when scanned by a reader, make life a little bit easier.
The "body hacking" movement has its controversies, but these implants are practical. IT expert Patrick Paumen toldThe Wall Street Journal that he has several implants that unlock things like his apartment, his office and the gate to his parking spot. You can forget to carry an access card, but you can't forget your own hand.
According to The Wall Street Journal, some people put their medical information and emergency contacts in the implants. In the future, this might become commonplace, instead of having to wear a medical ID bracelet.