"As human beings, we are vulnerable to confusing the unprecedented with the improbable. In our everyday experience, if something has never happened before, we are generally safe in assuming it is not going to happen in the future, but the exceptions can kill you and climate change is one of those exceptions."

"While President Bush likes to project an image of strength and courage, the real truth is that in the presence of his large financial contributors, he is a moral coward."

"Winston Churchill aroused this nation in heroic fashion to save civilisation in World War Two. We have everything we need except political will, but political will is a renewable resource."

"I took the initiative in moving forward a whole range of initiatives that have proven to be important to our country's economic growth, environmental protection, improvements in our educational system."

"Unlike scientism, science in the true sense of the word is open to unbiased investigation of any existing phenomena."

"If I can get some student interested in science, if I can show members of the general public what's going on up there in the space program, then my job's been done."

"I am a pastor, and I teach and preach the Bible to my congregation every week. But the Bible is not a manufacturer's handbook. Neither is it a science textbook nor a guidebook for public policy."

"The rise of Google, the rise of Facebook, the rise of Apple, I think are proof that there is a place for computer science as something that solves problems that people face every day."