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" Absence of evidence is not evidence of absence. "

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" Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. "

" Most of the people that I deal with are human. So I've had a lot of experience with that. "

" For small creatures such as we the vastness is bearable only through love. "

" The universe seems neither benign nor hostile, merely indifferent. "

" If you wish to make an apple pie from scratch, you must first invent the universe. "

" Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. "

" We're in very bad trouble if we don't understand the planet we're trying to save. "

" We start out a million years ago in a small community on some grassy plain; we hunt animals, have children, and develop a rich social, sexual, and intellectual life, but we know almost nothing about our surroundings. "

" I've written a number of books that have to do with the evolution of humans, human intelligence, human emotions. "

" If we long to believe that the stars rise and set for us, that we are the reason there is a Universe, does science do us a disservice in deflating our conceits? "

" The dangers of not thinking clearly are much greater now than ever before. It's not that there's something new in our way of thinking - it's that credulous and confused thinking can be much more lethal in ways it was never before. "

" The professed function of the nuclear weapons on each side is to prevent the other side from using their nuclear weapons. If that's all it is, then we've gotta as: how many nuclear weapons do you need to do that? "

Nuclear Weapons

" You probably don't need more weapons than what's required to destroy every city on earth. There's only 2,300 cities. So, the United States, by that criteria, only needs 2,300 nuclear weapons - well, we've got more than 25,000! "

" Extinction is the rule. Survival is the exception. "

" When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it. "

" Even these stars, which seem so numerous, are as sand, as dust - or less than dust - in the enormity of the space in which there is nothing. "

" No other planet in the solar system is a suitable home for human beings; it's this world or nothing. That's a very powerful perception. "

" The universe is not required to be in perfect harmony with human ambition. "

" Science is a way of thinking much more than it is a body of knowledge. "

" But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright Brothers. But they also laughed at Bozo the Clown. "

" We are not without empathetic terror when we open Pascal's 'Pensees' and read, 'I am the great silent spaces between worlds.' "

" There is a wide, yawning black infinity. In every direction, the extension is endless; the sensation of depth is overwhelming. And the darkness is immortal. Where light exists, it is pure, blazing, fierce; but light exists almost nowhere, and the blackness itself is also pure and blazing and fierce. "

" For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. "

" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "

" It's been said that astronomy is a humbling and, I might add, a character-building experience. "

" It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring. "

" We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces. "

" In our obscurity - in all this vastness - there is no hint that help will come from elsewhere to save us from ourselves. It is up to us. "

" Imagination will often carry us to worlds that never were. But without it we go nowhere. "

" Today, we're still loaded down - and, to some extent, embarrassed - by ancient myths, but we respect them as part of the same impulse that has led to the modern, scientific kind of myth. But we now have the opportunity to discover, for the first time, the way the universe is in fact constructed as opposed to how we would wish it to be constructed. "