No more annoying passwords to remember! Capsules could be swallowed and beam out unique data from inside your body to access online services. These capsules could detect, for example glucose levels, and send out information in an encrypted format to prevent hacking. The batteries of such devices could be powered by stomach acid! Other options include embedding think silicon chips into the skin, which would measure the heart’s unique electrical activity and transmit the information. The ideas have been publicised by PayPal’s global…