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Travel guides have been a thing for a very long time

• ralusek 9y ago
  But that's just another memory surrogate...
  • gargravarr 9y ago
    It's commonly quoted (probably inaccurately) that Einstein never bothered remembering his home phone number because it could easily be looked up in a phone book. The brain very regularly expands outside itself to think or remember, almost like subcontracting. Smartphones have just made them a one-stop shop for all our external thinking now.