In the OP I mention how little we know
It's all about perspective though right? The OP mentions our understanding of the beginnings of the universe to be likened to a grain of sand upon a beach. To me that suggests the "truth" (whatever that means to people) is pretty much wide open to both interpretation and ability to study and learn.
That's also maybe an issue of perspective, not seeing what's right before our eyes. Once we've seen something, we tend to see the same thing in it over and over again. It's hard to look at something old with new eyes. But we all look at the world around us in slightly different ways, being all individual and whatnot, so maybe it takes a while before someone comes along who looks at the world in just the 'right kind of different' way to show us what was there all along.Another point would be not noting what is right before our eyes.