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" According to 'M' theory, ours is not the only universe. Instead, 'M' theory predicts that a great many universes were created out of nothing. "
" Many people find the universe confusing - it's not. "
" When we understand string theory, we will know how the universe began. It won't have much effect on how we live, but it is important to understand where we come from and what we can expect to find as we explore. "
" The universe is not indifferent to our existence - it depends on it. "
" Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill. "
" The fastest manned vehicle in history was Apollo 10. It reached 25,000 mph. "
" To confine our attention to terrestrial matters would be to limit the human spirit. "
" I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science. "
" The usual approach of science of constructing a mathematical model cannot answer the questions of why there should be a universe for the model to describe. Why does the universe go to all the bother of existing? "
" I think the discovery of supersymmetric partners for the known particles would revolutionize our understanding of the universe. "
" It now appears that the way the universe began can indeed be determined, using imaginary time. "
" Obviously, because of my disability, I need assistance. But I have always tried to overcome the limitations of my condition and lead as full a life as possible. I have traveled the world, from the Antarctic to zero gravity. "
" We think that life develops spontaneously on Earth, so it must be possible for life to develop on suitable planets elsewhere in the universe. But we don't know the probability that a planet develops life. "
" 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. "
" My work and my family are very important to me. "
" In Britain, like most of the developed world, stem-cell research is regarded as a great opportunity. America will be left behind if it doesn't change policy. "
" The voice I use is a very old hardware speech synthesizer made in 1986. I keep it because I have not heard a voice I like better and because I have identified with it. "
" My father was a research scientist in tropical medicine, so I always assumed I would be a scientist, too. I felt that medicine was too vague and inexact, so I chose physics. "
" The Planck satellite may detect the imprint of the gravitational waves predicted by inflation. This would be quantum gravity written across the sky. "
" I believe there are no questions that science can't answer about a physical universe. "
" Earth might one day soon resemble the planet Venus. "
" In my school, the brightest boys did math and physics, the less bright did physics and chemistry, and the least bright did biology. I wanted to do math and physics, but my father made me do chemistry because he thought there would be no jobs for mathematicians. "
" With genetic engineering, we will be able to increase the complexity of our DNA, and improve the human race. But it will be a slow process, because one will have to wait about 18 years to see the effect of changes to the genetic code. "
" The Paralympic Games is about transforming our perception of the world. "
" Up until the 1920s, everyone thought the universe was essentially static and unchanging in time. "
" My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all. "
" 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. "
" A zero-gravity flight is a first step toward space travel. "
" Many badly needed goals, like fusion and cancer cure, would be achieved much sooner if we invested more. "
" Among physicists, I'm respected I hope. "
" Success in creating AI would be the biggest event in human history. Unfortunately, it might also be the last, unless we learn how to avoid the risks. "