"Sometimes I think we're alone in the universe, and sometimes I think we're not.

"Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering."
-- Arthur C. Clarke (author and futurist, 1917-2008)
http://en.wikipedia.org/wiki/Arthur_C._Clarke

"Equipped with his five senses, man explores the universe around him and calls the adventure Science."

"Equipped with his five senses, man explores the universe around him and calls the adventure Science."
-- Edwin Hubble (astronomer, 1889-1953)
http://en.wikipedia.org/wiki/Edwin_Hubble

"All the advantages that man has gained from his ever-deepening understanding of the natural world that surrounds...

"All the advantages that man has gained from his ever-deepening understanding of the natural world that surrounds him, his technological, chemical and medical progress, all of which should seem to alleviate human suffering... tends instead to favor humanity's destruction."
-- Konrad Lorenz (zoologist & ethologist, 1903-1989)
http://en.wikipedia.org/wiki/Konrad_Lorenz

"Prediction is very difficult, especially if it's about the future."

"Prediction is very difficult, especially if it's about the future."
-- Niels Bohr (physicist, 1885-1962)
http://en.wikipedia.org/wiki/Niels_Bohr

"The word 'belief' is a difficult thing for me.

"The word 'belief' is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it - I don't need to believe it."
-- Carl Jung (psychologist & psychiatrist, 1875-1961)
http://en.wikipedia.org/wiki/Carl_Jung

"The desire that guides me in all I do is the desire to harness the forces of nature to the service of mankind."

"The desire that guides me in all I do is the desire to harness the forces of nature to the service of mankind."
-- Nikola Tesla (physicist & engineer, 1856-1943)
http://en.wikipedia.org/wiki/Nikola_Tesla

"Physics is like sex: sure, it may give some practical results, but that's not why we do it."

"Physics is like sex: sure, it may give some practical results, but that's not why we do it."
-- Richard Feynman (theoretical physicist, 1918-1988)
http://en.wikipedia.org/wiki/Feynman