Tough road. There were many mysteries then. There are very few mysteries today.
“There are very few mysteries today.”
Actually there are plenty.
That's just flat wrong, absurdly wrong. Jaw-droppingly wrong.
Human knowledge is like fractal; or, if you can't imagine a fractal, it's like a gigantic spreading tree. A tree grows, and grows, and grows, and every new little green twig on that tree has a bud of mystery.