"When you're younger, you think of your age in fractions. 4 1/2, 5 1/2. You don't hear 36 1/2. You become 2, you turn 40, you reach 50, you make it to 60. By now you're going so fast you hit 70!"

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You can always create a fraction by putting one variable upstairs and another variable downstairs, but that soes not establish any causal relationship between them, nor does the resulting quotient have any necessary relationship to anything in the real world.

— Thomas Sowell