You only need 33 bits of information to uniquely identify a living person (and probably no more than 38 bits to identify any person who ever lived). Everything

You only need 33 bits of information to uniquely identify a living person (and probably no more than 38 bits to identify any person who ever lived). Everything provides some information, 0.01 bits here, 3 bits there - e.g. a bit of information such as "understands english" is already 2.5 bits. It's just a meter of integrating all those observation into one coherent estimate.