This is a nice introductory piece.
http://www.nanogallery.info/news/?id...ews&type=anews
http://www.usatoday.com/tech/science...rse/52951768/1
"...Nothing is something, it turns out, in physics. The equations that explain the innards of atoms produce so-called "virtual" particles that pop in and out of existence all the time on the sub-atomic level. These virtual particles cancel out each other at the end of the day, but in the meantime they lend atomic particles most of their mass. And their existence can be measured in electrical phenomena apparent at very small scales, such as the "Casamir" effect, observable as the attraction of two mirrors towards one another in a vacuum when placed very close together..."
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