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There was nothing that exploded and turned into the precise equivalent of nothing whilst actually being quite a lot of thing.
Genius!
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Sort of. The energy represented by matter, energy and inflation precisely cancel out the negative gravitational energy, but only providing that the topology of the universe is flat.
We do actually see something from nothing all the time. Basic quantum uncertainty energy fluctuations in the fabric of vacuum itself sponaneously produce particles such as electrons and their anti-particles (positrons). But they must be dissappear rapidly. The gravity of a black hole can separate these pairs, preventing their annihilation, by capturing one of the pairs. But the mass of the the other particles is ultimately provided by the black hole itself, so over time black holes "evaporate" into nothing.