"Science is the search for truth, but it is not the search for certainty. When science is used to search for certainty, it becomes something other than science."

"I believe that the human spirit is indomitable, and that we can overcome any challenge if we set our minds to it."

"The greatest discoveries of science have always been made by those who were not afraid to challenge the existing paradigms."

"I have always been a curious person, and I believe that curiosity is the key to discovery."

"Like thousands of other boys, I had a little chemical laboratory in our cellar and think that some of our friends thought me a bit crazy."