"If you want peace, you don't talk to your friends. You talk to your enemies."

"Before Nelson Mandela was arrested in 1962, he was an angry, relatively young man. He founded the ANC's military wing. When he was released, he surprised everyone because he was talking about reconciliation and forgiveness and not about revenge."

"My humanity is bound up in yours, for we can only be human together."

"Inclusive, good-quality education is a foundation for dynamic and equitable societies."

"The man of science has learned to believe in justification, not by faith, but by verification."

"Science fiction writers foresee the inevitable, and although problems and catastrophes may be inevitable, solutions are not."

"Research and development needs permanent tax credits to build the technology that spurs our growth. But no government programs alone can get America's students to study more science and math parents must push and help their children to meet this goal."

"There's only one corner of the universe you can be certain of improving, and that's your own self."