"I generally find that comparison is the fast track to unhappiness. No one ever compares themselves to someone else and comes out even. Nine times out of ten, we compare ourselves to people who are somehow better than us and end up feeling more inadequate."

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One of the most important things about the geology on the moon is your descriptions of what you see, comparing them to things that you've seen on Earth so that the geologists and the scientists on the ground would know what you're talking about; and then take pictures of them.

— Gene Cernan