You mustn't think of the Universe as a wilderness. It hasn't been that for billions of years," he said. "Think of it more as... ..cultivated.

Somewhere, something incredible is waiting to be known.

It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.

The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.

Imagination will often carry us to worlds that never were. But without it we go nowhere.

I don't want to believe. I want to know.

The absence of evidence is not the evidence of absence.

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.

For small creatures such as we the vastness is bearable only through love.

You have to know the past to understand the present.

Are you going to hand your children over to Big Food, Big Med and Big Pharma? That journey begins with the choice to bottle feed, then it's all down hill from there.

Good Americans when they die go to Paris.

Science is simply common sense at its best - that is rigidly accurate in observation and merciless to fallacy in logic.

Think about the fool who by his virtue can be found in a most unusual situation playing jester to the clown.

I'm not macho. I'm very open about things. I don't try to hide my feelings.

Is it ignorance or apathy? Hey, I don't know and I don't care.

Science is the art of the solvable.

Every day we're given opportunities, some of us see them and some are too busy to notice.

The (stock) market is there only as a reference point to see if anybody is offering to do anything foolish. When we invest in stocks, we invest in businesses.

Conquest is easy. Control is not.