I tell my students to try early in life to find an unattainable objective.

There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.

Dropping those atomic bombs on Hiroshima and Nagasaki was a war crime.

Civilization will end within 15 or 30 years unless immediate action is taken against problems facing mankind.

It would be a poor thing to be an atom in a universe without physicists, and physicists are made of atoms. A physicist is an atom's way of knowing about atoms.

A physicist is an atom's way of knowing about atoms.

I have lived much of my life among molecules. They are good company.

We are the products of editing, rather than of authorship.

I do not want to believe in God. Therefore I choose to believe in that which I know is scientifically impossible, spontaneous generation leading to evolution.

All War Departments are now Defense Departments. This is all part of the doubletalk of our time. The aggressor is always on the other side.

Nuclear weapons offer us nothing but a balance of terror, and a balance of terror is still terror.

Shrug off the no’s – they are temporary. This is your world. In your world there is only yes.

Any religion which demands death for other people is itself worthy of nothing less than it expects for others. In fact, it is probably long overdue.

Love is the source of great power and great strength.

Almost every day, someone asks if I ever flat iron my hair. I say, 'No, because I'm afraid it wouldn't look good and wouldn't come back curly.'

Utopia is not one of the options.

When I wanna be a superhero I just wake up.

Wear what you feel comfortable with. People say nasty things about what I wear in the street. I'm always in worst dressed lists, but you just have to dress for yourself and ­nobody else.

The politicians in Washington are spending trillions of dollars of our money. When are Americans going to stand up and say enough is enough?

Don't feel bad, Angela," Kami said. "You know guys, they only want one thing. Repartee. I can't count how many times men have admired my well-turned phrases.

Leadership is not a rank, it's a choice.