Once you get to a full fledged, capable nanotechnology, the kind of thing you could build would be that when you pull that pen out, you throw it, and it expands in the air. It's still not no heavier than the pen was, because, you know, it doesn't do anything to gain a mass. The body's size, shape and strength, in particular, would be essentially equivalent tot a human being. But that's roughly the capability of nanote reduced toa simple personal scale.

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