"Give Brad Williams a date, and he can usually tell you not only what he was doing but what world events happened that day ... it seems to indicate there's no -- or not much -- intentional calculation going on"

It seems to me that his memory is indexed by date.

Why is this here? Put this on reddit or digg but not here.

Shades of Jorge Luis Borges' 'Funes, the Memorious':

http://io.uwinnipeg.ca/~morton/bigidea/funes.txt

Upvote Borges reference!