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" I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth. "
Stephen Hawking
Universe
Intelligence
Believe
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" I don't think the human race will survive the next thousand years, unless we spread into space. "
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" The past, like the future, is indefinite and exists only as a spectrum of possibilities. "
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" 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. "
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" 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. "
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" The fastest manned vehicle in history was Apollo 10. It reached 25,000 mph. "
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Mph
Vehicle
Fastest
" Only black holes of very low mass would emit a significant amount of radiation. "
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" Maybe I don't have the most common kind of motor neuron disease, which usually kills in two or three years. "
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" There are plenty of dead scientists I admire, but I can't think of any living ones. This is probably because it is only in retrospect that one can see who made the important contributions. "
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" 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. "
Stephen Hawking
Stars
Motivational
Feet
" People won't have time for you if you are always angry or complaining. "
Stephen Hawking
Always
People
Angry
" It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years. "
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Loss
Work
You
" My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all. "
Stephen Hawking
Understanding
Simple
Goal
" The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years. "
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Two
Disease
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" The radiation left over from the Big Bang is the same as that in your microwave oven but very much less powerful. It would heat your pizza only to minus 271.3*C - not much good for defrosting the pizza, let alone cooking it. "
Stephen Hawking
Cooking
Alone
Pizza
" 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. "
Stephen Hawking
Special
Space
Us
" Time travel used to be thought of as just science fiction, but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out. "
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Space
Travel
Time
" Sometimes I wonder if I'm as famous for my wheelchair and disabilities as I am for my discoveries. "
Stephen Hawking
Famous
I Am
Sometimes
" I was never top of the class at school, but my classmates must have seen potential in me, because my nickname was 'Einstein.' "
Stephen Hawking
School
Class
Classmates
" People who boast about their I.Q. are losers. "
Stephen Hawking
About
Boast
Losers
" Earth might one day soon resemble the planet Venus. "
Stephen Hawking
Earth
Planet
Soon
" Science is increasingly answering questions that used to be the province of religion. "
Stephen Hawking
Science
Used
Questions
" In less than a hundred years, we have found a new way to think of ourselves. From sitting at the center of the universe, we now find ourselves orbiting an average-sized sun, which is just one of millions of stars in our own Milky Way galaxy. "
Stephen Hawking
Sun
Universe
Think
" Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker. "
Stephen Hawking
Forever
Universe
Will
" There's no way to remove the observer - us - from our perceptions of the world. "
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World
Perceptions
Our
" Some people would claim that things like love, joy and beauty belong to a different category from science and can't be described in scientific terms, but I think they can now be explained by the theory of evolution. "
Stephen Hawking
Beauty
Love
Now
" Time travel was once considered scientific heresy, and I used to avoid talking about it for fear of being labelled a 'crank.' "
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Travel
Fear
Time
" I am just a child who has never grown up. I still keep asking these 'how' and 'why' questions. Occasionally, I find an answer. "
Stephen Hawking
Never
Find
Child
" Before I lost my voice, it was slurred, so only those close to me could understand, but with the computer voice, I found I could give popular lectures. I enjoy communicating science. It is important that the public understands basic science, if they are not to leave vital decisions to others. "
Stephen Hawking
Science
Decisions
Voice
" I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming. "
Stephen Hawking
Power
Global Warming
Pollution
" Life on Earth is at the ever-increasing risk of being wiped out by a disaster, such as sudden global nuclear war, a genetically engineered virus or other dangers we have not yet thought of. "
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War
Thought
Out