A. The idea is to be "always ready", for example, you might look up the definition of "wearable computer" online (such as in the about.com "encyclopedia"), or you might interact with people through the medium, while doing other things. You might also constantly grab images into a circular buffer, and then retroactively record something. In this way, you're always ready, and seldom miss a good shot. Retroactive recording allows you to, for example, issue a command like "begin recording starting from five minutes ago". With a hand held camera, you would have missed that great shot, or failed to get a good picture of the perpetrator (criminal) or perpetraitor (corrupt official).

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