The human brain does something different in the two cases.

Less than eight percent of the human brain was ever used.

The human brain has more than two billion of them.

More than 90 percent of the human brain is never used.

I was getting quite used to having a human brain again.

At age five, the human brain is 90% of its total size.

Well then, the human brain it will have to be.

That was what came of having a human brain, I told myself.

We believe people would be afraid of a being with a human brain.

Scientists have more work to do in learning about the human brain.