"As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on."

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Behave in life as at a dinner party. Is anything brought around to you? Put out your hand and take your share with moderation. Does it pass by you? Do not stop it. Is it not yet come? Do not stretch your desire towards it, but wait till it reaches you. Do this with regard to children, to a spouse, to public post, to riches, and you will eventually be a worthy guest at the feast of life.

— A.C. Grayling