What are some of the earliest "firsts" that we have a definite date for?
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We only know about when humans mastered fire or started using metal. But we know the exact date when the first powered flight took place. What are some really early "first ____" we know the date of for sure?
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Well.... Maybe.
Time probably predates the big bang
I kind of wonder if time might be infinite in both directions, just because having a definitive beginning or end would seem to violate the conservation of matter and energy.
Why? Conversation of energy doesn't include time in any way. I'd love to hear your thoughts!