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Empty space is a boiling, bubbling brew of virtual particles that pop in and out of existence in a time scale so short that you can't even measure them.

"Lawrence Krauss On 'A Universe From Nothing'". Interview with Ira Flatow, www.npr.org. January 13, 2012.
Empty space is a boiling, bubbling brew of virtual particles that pop in and out of existence in a time scale so short that you can't even measure them.