Scientists currently tag animals to study their behavior and protect the endangered, but some futurists wonder whether all humans should be tagged too.

It's a simple concept, really: You inject a miniature radio frequency identifier the size of a grain of rice between your thumb and forefinger and, with a wave of your hand, unlock doors, turn on lights, start your car or pay for your drinks at an ultrachic nightspot.

This article seeks to enlighten people about the spiritual symbolism of the number 666