When you shine a beam of light on your hand, you don’t feel much, except for a little bit of heat generated by the beam. When you shine that same light into a world that is measured on the nano- or micro scale, the light becomes a powerful manipulating tool that you can use to move objects around – trapped securely in the light.
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African’s seem to really be into lasers; a few years ago they showed how to make the laser light in arbitrary shapes. Usually, the laser light comes out randomly.
They said this can work with plama; if they can do that, they should be able to do nano-chemistry!