"Just like an ordinary guitar string, a fundamental string can vibrate in different modes. And it is these different modes of vibration of the string that are understood in string theory as being the different elementary particles."

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Children often have been likened to scientists. Both ask fundamental questions about the nature of the universe. Both also ask innumerable questions that seem utterly trivial to others. Finally, both are granted by society the time to pursue their musings.

— Robert S. Siegler