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.

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