Money is becoming much more of a concept than a physical entity, and most ordinary mortals haven't really noticed the switch.

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Hollywood is still clinging on to the concept of selling physical goods like BluRay and DVD disks and giving those formats an advantage over legal streams.

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General interest is a pretty good concept for a physical product that gets delivered to your doorstep, where getting all those disparate sections bundled together makes sense.

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However, the results of the study reinforce the concept that any consistent physical activity can produce long term benefits.

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Bower's company took the idea of an Android-based gaming tablet with a proprietary, physical (and removable) gamepad from concept to reality in the last year, first revealing the tablet at CES 2012.

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"Smart builds upon the existing concept of 'smart cities', physical spaces which are covered in an array of intelligent sensors which communicate with each other and can be searched for information, " said Dr Iadh Ounis of the University of Glasgow's School of Computing Science.

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Extending that concept even further are people, process, physical evidence, packaging, partners and payment.

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He writes actual letters, physical objects that can be stolen by someone who does not know how to hack a computer, a novel concept in 2013.

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