A physicist, an engineer and a psychologist are called in as consultants to a dairy farm whose production has been below par. Each is given time to inspect the details of the operation before making a report. The first to be called is the engineer, who states: "The size of the stalls for the cattle should be decreased. Efficiency could be improved if the cows were more closely packed, with a net allotment of 275 cubic feet per cow. Also, the diameter of the milking tubes should be increased by 4 percent to allow for a greater average flow rate during the milking periods." The next to report is the psychologist, who proposes:"The inside of the barn should be painted green. This is a more mellow color than brown and should help induce greater milk flow. Also, more trees should be planted in the fields to add diversity to the scenery for the cattle during grazing, to reduce boredom." Finally, the physicist is called upon. He asks for a blackboard and then draws a circle. He begins: "Assume the cow is a sphere....

— Lawrence M. Krauss

Aside from communications satellites, space is devoid of industry.

— Lawrence M. Krauss

A universe without purpose should neither depress us nor suggest that our lives are purposeless. Through an awe-inspiring cosmic history we find ourselves on this remote planet in a remote corner of the universe, endowed with intelligence and self-awareness. We should not despair, but should humbly rejoice in making the most of these gifts, and celebrate our brief moment in the sun.

— Lawrence M. Krauss

By no definition of any modern scientist is intelligent design science, and it's a waste of our students' time to subject them to it.

— Lawrence M. Krauss

Empty space is a boiling, bubbling brew of virtual particles that pop in and out of existence in a timescale so short that you can't even measure them.

— Lawrence M. Krauss

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.

— Lawrence M. Krauss

For most people, the central questions of existence ultimately come down to transcendental ones: Why is there a universe at all? Why are we here? Whatever presumptions one might bring to the question "Why?," if we understand the "how" better, "why" will come into sharper focus.

— Lawrence M. Krauss

I cannot stress often enough that what science is all about is not proving things to be true but proving them to be false.

— Lawrence M. Krauss

I don't know if science and reason will ultimately help guide humanity to a better and more peaceful future, but I am certain that this belief is part of what keeps the 'Star Trek' fandom going.

— Lawrence M. Krauss

If the universe doesn't care about us and if we're an accident in a remote corner of the universe, in some sense it makes us more precious. The meaning in our lives is provided by us; we provide our own meaning.

— Lawrence M. Krauss