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" Earth might one day soon resemble the planet Venus. "
" My three children have brought me great joy. "
" A few years ago, the city council of Monza, Italy, barred pet owners from keeping goldfish in curved bowls... saying that it is cruel to keep a fish in a bowl with curved sides because, gazing out, the fish would have a distorted view of reality. But how do we know we have the true, undistorted picture of reality? "
" There is nothing bigger or older than the universe. "
" Exploration by real people inspires us. "
" The missing link in cosmology is the nature of dark matter and dark energy. "
" Stem cell research is the key to developing cures for degenerative conditions like Parkinson's and motor neuron disease from which I and many others suffer. The fact that the cells may come from embryos is not an objection, because the embryos are going to die anyway. "
" What I'd really like to control is not machines, but people. "
" There are too many accidents that can befall life on a single planet. "
" The fastest manned vehicle in history was Apollo 10. It reached 25,000 mph. "
" My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand. "
" There could be shadow galaxies, shadow stars, and even shadow people. "
" Sometimes I wonder if I'm as famous for my wheelchair and disabilities as I am for my discoveries. "
" I think those who have a terminal illness and are in great pain should have the right to choose to end their own life, and those that help them should be free from prosecution. "
" Cosmology is a rapidly advancing field. "
" Science can lift people out of poverty and cure disease. That, in turn, will reduce civil unrest. "
" We must develop as quickly as possible technologies that make possible a direct connection between brain and computer, so that artificial brains contribute to human intelligence rather than opposing it. "
" I think it quite likely that we are the only civilization within several hundred light years; otherwise we would have heard radio waves. "
" The media need superheroes in science just as in every sphere of life, but there is really a continuous range of abilities with no clear dividing line. "
" My wife and I love each other very much. "
" It is generally recognised that women are better than men at languages, personal relations and multi-tasking, but less good at map-reading and spatial awareness. It is therefore not unreasonable to suppose that women might be less good at mathematics and physics. "
" The universe is governed by science. But science tells us that we can't solve the equations, directly in the abstract. "
" I grew up thinking that a research scientist was a natural thing to be. "
" There is no physical law precluding particles from being organised in ways that perform even more advanced computations than the arrangements of particles in human brains. "
" My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all. "
" I can't disguise myself with a wig and dark glasses - the wheelchair gives me away. "
" If the rate of expansion one second after the Big Bang had been smaller by even one part in a hundred thousand million million, it would have recollapsed before it reached its present size. On the other hand, if it had been greater by a part in a million, the universe would have expanded too rapidly for stars and planets to form. "
" As scientists, we step on the shoulders of science, building on the work that has come before us - aiming to inspire a new generation of young scientists to continue once we are gone. "
" We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet. "
" Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious. "
" A zero-gravity flight is a first step toward space travel. "