Time travel simply didn't fit into his understanding of the natural world.

Our understanding of the physical world would no longer be the same.

What are the implications for our understanding of the world?

The old man has no understanding of the real world.

I wanted to feel global in my understanding of the world.

I am taking you now to the next step in your understanding of the world.

And having lived so many years in between cultures helped his understanding of the world, he said.

Over all, she says, "the two jobs gave me a good understanding of the world."

They have an understanding of the world as a real place.

Our understanding of the world around us is based on theory.