The concept of which, in my life time (since 1958) has gone from simply being the mind - regarded as a store of things remembered, to science and technology’s creation of the computer and it’s collateral storage devices - which have literally become an extension of our personal physiological faculty, thanks to google and the "contacts" app on your iphone. 

Case in point - How many telephone numbers do you know by heart - on demand - right now? ...READ THE FULL BLOG