"What a mystery blood was -- how did a tiny gesture, a tome of voice, endure through generations like the harder verities of flesh? He had seen it again and again, watching his nieces and nephews grow, and accepted without thought the ehoes of parent and grandparent that appeared for brief moments. the shadow of a face looking back through the years -- that vanished again into the face that was now."

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It is a good principle in science not to believe any 'fact'---however well attested---until it fits into some accepted frame of reference. Occasionally, of course, an observation can shatter the frame and force the construction of a new one, but that is extremely rare. Galileos and Einsteins seldom appear more than once per century, which is just as well for the equanimity of mankind.

— Arthur C. Clarke