Science of the Moment
October 29, 2005
During the Planck era, the Universe can be best described as a quantum foam of 10 dimensions containing Planck length sized black holes continuously being created and annihilated with no cause or effect. In other words, try not to think about this era.
--James Schombert, Early Universe Primer. I found this while googling for the source of how there's "a difference between something and nothing, but it is purely geometrical", usually attributed to Martin Gardner, so I'm confused about proper attribution. (And besides, I like Paul Valery's "God made everything out of nothing, but the nothingness shows through." a bit better.)