I think the other big "what if" question was if Hero of Alexandria's steam engine, or "Aeolipile", had been noticed, and it's practicality been put into practice 1700 years before the Industrial Revolution. The difference in human history it would have made makes my mouth water; a steam powered Roman Empire...
But of course, as Cambyses said, these are merely diversions from real history, but bloody interesting diversions at that.
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