If life is effectively an endless series of photocopies, as DNA is transcribed and passed on from one being to the next, then evolution is the high-stakes game of waiting for the copier to get it wrong. Too wrong, and you’ll live burdened by a maladaptive mutation or genetic disorder.
from My Pocket https://www.washingtonpost.com/news/morning-mix/wp/2016/01/11/startling-new-discovery-600-million-years-ago-a-single-biological-mistake-changed-everything/
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