Richard Feynman quotations

I was born not knowing and have had only a little time to change that here and there.

It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

Reality must take precedence over public relations, for nature cannot be fooled.

The easiest person to fool is yourself.

It does no harm to the mystery to know a little about it.

Nelson Mandela quotations

And as we let our own light shine, we unconsciously give other peoplepermission to do the same.

Education is the most powerful weapon which you can use to change the world.

For to be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

Carl Sagan Quotations

http://en.wikiquote.org/wiki/Carl_Sagan

We make our world significant by the courage of our questions and by the depth of our answers.

Stephen Hawking quotations

http://en.wikiquote.org/wiki/Stephen_Hawking
For millions of years, mankind lived just like the animals. Then something happened which unleashed the power of our imagination. We learned to talk and we learned to listen. Speech has allowed the communication of ideas, enabling human beings to work together to build the impossible. Mankind's greatest achievements have come about by talking, and its greatest failures by not talking. It doesn't have to be like this. Our greatest hopes could become reality in the future. With the technology at our disposal, the possibilities are unbounded. All we need to do is make sure we keep talking.

Steven Hawking in the news

http://discovermagazine.com/2009/jul-aug/11-stephen-hawking-is-making-his-comeback