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" The universe is not indifferent to our existence - it depends on it. "
" 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. "
" Up until the 1920s, everyone thought the universe was essentially static and unchanging in time. "
" I think we have a good chance of surviving long enough to colonize the solar system. "
" Even if it turns out that time travel is impossible, it is important that we understand why it is impossible. "
" The cyclic universe theory predicts no gravitational waves from the early universe. "
" Although almost every theoretical physicist agrees with my prediction that a black hole should glow like a hot body, it would be very difficult to verify experimentally because the temperature of a macroscopic black hole is so low. "
" It's time to commit to finding the answer, to search for life beyond Earth. Mankind has a deep need to explore, to learn, to know. We also happen to be sociable creatures. It is important for us to know if we are alone in the dark. "
" Wagner manages to convey emotion with music better than anyone, before or since. "
" Science is increasingly answering questions that used to be the province of religion. "
" People who boast about their I.Q. are losers. "
" I am in touch with a company that hopes to replicate my voice. However, they are not replicating my original voice - if they did that, I would sound like a man in his 20s, which would be very strange! They are actually trying to replicate the synthesizer that sits on my wheelchair. "
" The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order, which may or may not be divinely inspired. "
" Before 1915, space and time were thought of as a fixed arena in which events took place, but which was not affected by what happened in it. Space and time are now dynamic quantities... space and time not only affect but are also affected by everything that happens in the universe. "
" Many badly needed goals, like fusion and cancer cure, would be achieved much sooner if we invested more. "
" One can't predict the weather more than a few days in advance. "
" I was born on January 8, 1942, exactly three hundred years after the death of Galileo. I estimate, however, that about two hundred thousand other babies were also born that day. I don't know whether any of them was later interested in astronomy. "
" Work gives you meaning and purpose and life is empty without it. "
" The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years. "
" We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet. "
" To my mathematical brain, the numbers alone make thinking about aliens perfectly rational. The real challenge is to work out what aliens might actually be like. "
" We are all now connected by the Internet, like neurons in a giant brain. "
" I hope I have helped to raise the profile of science and to show that physics is not a mystery but can be understood by ordinary people. "
" 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. "
" My work and my family are very important to me. "
" Maybe I don't have the most common kind of motor neuron disease, which usually kills in two or three years. "
" I wouldn't be here today if it were not for the NHS. I have received a large amount of high-quality treatment without which I would not have survived. "
" I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science. "
" We live in a bewildering world. "
" We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special. "
" I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming. "