Logging in with tattoos and pills may be a reality soon.

>The other innovation unveiled is a pill that a user can swallow, which then switches on, powered by the person’s stomach acid. The pill then transmits an 18-bit signal, essentially making the person a walking password.

I don't know how I feel about this one, nor do I understand how it would work. Do you have to do that every day? Every other day? How would the transmitter inside the pill actually stay in your body?