"The best way to predict the future is to invent it."

"What we need is more people who specialize in the impossible."

"A good scientist is a man with an original mind who can think straight, but who also has a practical sense of what is possible."

"We must never forget that the ultimate goal of all our space efforts is to improve life on Earth."

"Our knowledge and use of the laws of nature that enable us to fly to the Moon also enable us to destroy our home planet with the atom bomb. Science itself does not address the question whether we shou…"