"Someone could cut through the mess in our house and look at it like one might look at rings on a tree or layers of sediment. They'd find the black-and-white hairs of a dog we had when I was six, the acid-washed jeans my mother once wore, the seven blood-soaked pillowcases from the time I skinned my knee. All our family secrets rest in endless piles."

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You see, proteins, as I probably needn't tell you, are immensely complicated groupings of amino acids and certain other specialized compounds, arranged in intricate three-dimensional patterns that are as unstable as sunbeams on a cloudy day. It is this instability that is life, since it is forever changing its position in an effort to maintain its identity--in the manner of a long rod balanced on an acrobat's nose.

— Isaac Asimov