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Lawrence M. Krauss

Lawrence M. Krauss Books

Physicist

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“The one thing that I want every single child to have experienced at some point in their life, as part of their education, is to have some idea they hold to be true, and at the very basis of their being, proved to be wrong. Because that opens your mind to the realization that the world is different than you thought it would be, and you have to begin to open your mind to the possibilities of existence. And opening your mind frees you, it doesn't constrain you. It makes the world more wonderful, more exciting, and more worth living in.”

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Author:Lawrence M. Krauss
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“[...] It is. Philosophy is a field that, unfortunately, reminds me of that old Woody Allen joke, "those that can't do, teach, and those that can't teach, teach gym." And the worst part of philosophy is the philosophy of science; the only people, as far as I can tell, that read work by philosophers of science are other philosophers of science. It has no impact on physics what so ever, and I doubt that other philosophers read it because it's fairly technical. And so it's really hard to understand what justifies it. And so I'd say that this tension occurs because people in philosophy feel threatened, and they have every right to feel threatened, because science progresses and philosophy doesn't. [the atlantic, Has Physics Made Philosophy and Religion Obsolete? - interview, apr 23 2012]”

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“The saddest thing about these imagined deathbed conversions is that, even if they were real, they could hardly be seen as victories for Christ. They are stories in which the final pain of a fatal disease, or the fear of imminent death and eternal punishment, is identified as the factor necessary for otherwise rational people to believe in the supernatural. If mental torture is required to effect a conversion, what does that say about the reliability of the fundamental premises of Christianity to begin with? Evangelicals would be better advised to concentrate on converting the living. Converting the deceased suggests only that they can't convince those who can argue back. They should let the dead rest in peace.”

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“Every atom in your body came from a star that exploded. And, the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics: You are all stardust. You couldn’t be here if stars hadn’t exploded, because the elements - the carbon, nitrogen, oxygen, iron, all the things that matter for evolution and for life - weren’t created at the beginning of time. They were created in the nuclear furnaces of stars, and the only way for them to get into your body is if those stars were kind enough to explode. So, forget Jesus. The stars died so that you could be here today.”

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Author:Lawrence M. Krauss
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“The amazing thing is that every atom in your body came from a star that exploded. And, the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics: You are all stardust. You couldn’t be here if stars hadn’t exploded, because the elements - the carbon, nitrogen, oxygen, iron, all the things that matter for evolution - weren’t created at the beginning of time. They were created in the nuclear furnaces of stars, and the only way they could get into your body is if those stars were kind enough to explode. So, forget Jesus. The stars died so that you could be here today.”

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Book:A Universe from Nothing: Why There Is Something Rather than Nothing
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“When I am carrying an object such as a ruler, and moving fast compared to you, my ruler will be measured by you to be smaller than it is for me. I might measure it to be 10 cm, say: [Image] But to you, it might appear to be merely 6 cm: [Image] Surely, this is an illusion, you might say, because how could the same object have two different lengths? The atoms can’t be compressed together for you, but not for me. Once again, we return to the question of what is “real.” If every measurement you can perform on my ruler tells you it is 6 cm long, then it is 6 cm long. “Length” is not an abstract quantity but requires a measurement. Since measurement is observer dependent, so is length. To see this is possible while illuminating another of relativity’s slippery catch-22s, consider one of my favorite examples. Say I have a car that is twelve feet long, and you have a garage that is eight feet deep. My car will clearly not fit in your garage: [Image] But, relativity implies that if I am driving fast, you will measure my car to be only, say, six feet long, and so it should fit in your garage, at least while the car is moving: [Image] However, let’s view this from my vantage point. For me, my car is twelve feet long, and your garage is moving toward me fast, and it now is measured by me to be not eight feet deep, but rather four feet deep: [Image] Thus, my car clearly cannot fit in your garage. So which is true? Clearly my car cannot both be inside the garage and not inside the garage. Or can it? Let’s first consider your vantage point, and imagine that you have fixed big doors on the front of your garage and the back of your garage. So that I don’t get killed while driving into it, you perform the following. You have the back door closed but open the front door so my car can drive in. When it is inside, you close the front door: [Image] However, you then quickly open the back door before the front of my car crashes, letting me safely drive out the back: [Image] Thus, you have demonstrated that my car was inside your garage, which of course it was, because it is small enough to fit in it. However, remember that, for me, the time ordering of distant events can be different. Here is what I will observe. I will see your tiny garage heading toward me, and I will see you open the front door of the garage in time for the front of my car to pass through. I will then see you kindly open the back door before I crash: [Image] After that, and after the back of my car is inside the garage, I will see you close the front door of your garage: [Image] As will be clear to me, my car was never inside your garage with both doors closed at the same time because that is impossible. Your garage is too small. “Reality” for each of us is simply based on what we can measure. In my frame the car is bigger than the garage. In your frame the garage is bigger than my car. Period. The point is that we can only be in one place at one time, and reality where we are is unambiguous. But what we infer about the real world in other places is based on remote measurements, which are observer dependent.”

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Book:The Greatest Story Ever Told—So Far: Why Are We Here?
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“My area of research is something that in all fairness has no practical usability whatsoever and the thing is I'm often asked to apologize for that. It is interesting to me that people ask 'what's the point of doing that if it's not useful?' But they never ask that, or do they very rarely ask that about art or literature or music. Those things are not gonna produce a better toaster.”

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Author:Lawrence M. Krauss
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“Now, since the time of Newton there had been a debate about whether light was a wave - that is, a traveling disturbance in some background medium - or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave.”

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“Science has been effective at furthering our understanding of nature because the scientific ethos is based on three key principles: (1) follow the evidence wherever it leads; (2) if one has a theory, one needs to be willing to try to prove it wrong as much as one tries to prove that it is right; (3) the ultimate arbiter of truth is experiment, not the comfort one derives from one's a priori beliefs, nor the beauty or elegance one ascribes to one's theoretical models.”

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Book:A Universe From Nothing
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“Philosophy used to be a field that had content, but then natural philosophy became physics, and physics has only continued to make inroads. Every time theres a leap in physics, it encroaches on these areas that philosophers have carefully sequestered away to themselves, and so then you have this natural resentment on the part of philosophers.”

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Author:Lawrence M. Krauss
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“Discerning the merits of competing claims is where the empirical basis of science should play a role. I cannot stress often enough that what science is all about is not proving things to be true but proving them to be false. What fails the test of empirical reality, as determined by observation and experiment, gets thrown out like yesterday's newspaper.”

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Author:Lawrence M. Krauss
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“Our modern conception of the universe is so foreign to what even scientists generally believed a mere century ago that it is a tribute to the power of the scientific method and the creativity and persistence of humans who want to understand it.”

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Book:A Universe from Nothing: Why There Is Something Rather than Nothing
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