Science is more than a body of knowledge. It's a way of thinking: a way of skeptically interrogating the universe.

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.

In such seconds of decision entire futures are made.

However miserable you make us, we shall still have the revenge of thinking that your cruelty arises from your greater misery.

The health effects of air pollution imperil human lives. This fact is well-documented.

Let them impeach and be damned.

A lot of times people say, 'As soon as you relax you'll have a kid.'

See, my strumpf is in my hair. Now, I don't know what strumpf means. It's just a term some brothas gave me.

We are not quite novels. We are not quite short stories. In the end, we are collected works

Success isn't one straight line - it's a ladder, and there's always another rung above you to reach out for. Like anything else, there are ups and downs.

When things go wrong, I just think: It's part of the journey.

This desire of knowledge and the wonder which it hopes to satisfy are the driving power behind all the changes that we, with careless, question-begging inference, call progress.