"At certain point, you realize it's easy to play music for the rest of your life: just don't sell your guitar. Maybe you get a day job, but as long as you have a guitar, you can play."

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I had two passions when I was a child. First was to learn about Einstein's theory and help to complete his dream of a unified theory of everything. That's my day job. I work in something called string theory. I'm one of the founders of the subject. We hope to complete Einstein's dream of a theory of everything.

— Michio Kaku