(At the request of JustUWait221)
I know he isn't an author, but does that mean that his words are less true? :-)
And calm down, this isn't going to be a dull lesson in physics!

"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." 

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"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle." 

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"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world." 

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"If you can't explain it to a six-year-old, you don't understand it yourself." 

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"If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales." 

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"Life is like riding a bicycle. To keep your balance, you must keep moving." 

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"Anyone who has never made a mistake has never tried anything new." 

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"Never memorize something that you can look up." 

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"A clever person solves a problem. A wise person avoids it."

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"If I were not a physicist, I would probably be a musician. I often think in music. I live my daydreams in music. I see my life in terms of music."