Once students know the world, the next step is to control it.

According to him science is only one way of knowing the world with no special access to truth.

It was important to know the natural world extremely well.

The Earth is the only world known so far to harbor life.

So maybe he did not know the world well enough to read what Denny had written.

If you want to know stuff about yourself and the world we live in, there is a way of finding out - it's called science.

Others say children know the difference between reality and the fictional world of television.

Most parents don't really know the world of their children.

But he was one of those who will never know the world, even when they conquer it.

"The human mind is capable of knowing the world in different ways," he said.