Atlanta, Georgia (CNN) -- Quick: What's the fattiest system in
your body that has two halves and weighs between 2 and 4 pounds?
It's your brain -- you know, that thing that remembers stuff.
But because of rapidly evolving information technology, your
first impulse was probably to search for the answer on the
Internet. As we become ever more dependent on external sources
of memory -- using GPS to guide our driving, smartphones to keep
our schedules -- it's time to rethink our ideas about what
"memory" actually is. While we don't physically plug smartphones
and other devices into our heads, in some ways we're already one
with them, as evidenced by the anxiety we feel when we're
without them. Would you remember to pick up milk? Would you know
your parents' phone numbers? If you've ever found yourself
running late because you left your phone at home, "you might be
a cyborg," says Fred Trotter, a blogger who spoke about
information technology at the Health Journalism 2012 conference
in April. Brain implants that m