If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.

Nothing cannot exist forever.

Most sets of values would give rise to universes that, although they might be very beautiful, would contain no one able to wonder at that beauty.

Scientists have become the bearers of the torch of discovery in our quest for knowledge.

There is no unique picture of reality.

Science is not only a disciple of reason but, also, one of romance and passion.

There are grounds for cautious optimism that we may now be near the end ofthe search for the ultimate laws of nature.

We should seek the greatest value of our action.

I don't think the human race will survive the next thousand years, unless we spread into space.

I don't want to write an autobiography because I would become public property with no privacy left.

My work and my family are very important to me.

I believe in universal health care. And I am not afraid to say so.

No one can resist the idea of a crippled genius.

The universe is governed by science. But science tells us that we can't solve the equations, directly in the abstract.

There are too many accidents that can befall life on a single planet.

I enjoy all forms of music - pop, classical and opera.

I want to know why the universe exists, why there is something greater than nothing.

Theology is unnecessary.

Someone told me that each equation I included in the book would halve the sales.

You can't regulate every lab in the world.