two scientific miracles puzzled me?

[robvalue]

I'm glad to hear you are searching for the truth

I believe the whole truth will forever be outside our grasp, and it's the discomfort this brings that often motivates people to accept religious answers rather than just say "We don't know yet. We may find out, we may not."

You certainly don't find out anything by making stuff up.

If people in the past knew things, then obviously they found them out somehow. Finding out how they knew may not be possible, it depends how much evidence we have that we can consider. But they had brains, eyes and ears, and a lot of time to experience things. It's fairly reasonable to assume that they came to conclusions much the same way as we do now.