"Kaylee and Nash are like those rocks that ancient cave people used to make fire. Bang them together, and you get sparks." Sabine said. "Let's never again use the phrase 'bang them together' in reference to my brother and my girlfriend," Tod mumbled."

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The strength and weakness of physicists is that we believe in what we can measure. And if we can't measure it, then we say it probably doesn't exist. And that closes us off to an enormous amount of phenomena that we may not be able to measure because they only happened once. For example, the Big Bang. ... That's one reason why they scoffed at higher dimensions for so many years. Now we realize that there's no alternative.

— Michio Kaku