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*IF* our Universe was, for a small amount of time, so dense that all protons and neutrons in our Universe had a chance to fuse together into helium nuclei, then a specific fraction of those protons and neutrons would have done so in all parts of our Universe. We know that probability of such reactions at a specific density, and Big Bang Cosmology makes a specific prediction for the length of time that such a reaction could take place. When you do the math, you find that BBC predicts that all parts of our Universe should be about 90% hydrogen and 10% helium. That is, indeed, what we observe, even in those parts of the Universe where no stellar nucleo-synthesis has taken place. Those who advocate alternatives to BBC are reduced to stating, "This ratio is a fact about our Universe that I cannot explain -- it just IS that way."

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