"Those who foolishly pride themselves on their nobility mistake that which makes them noble, for it is only the virtue of their ancestors that gives them noble blood."

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Over millions of years the viruses in our genome mutate more and more so the look less and less and less recognizable as viruses and so if there was a virus that infected our pre mammal ancestors like 250 million years ago, which it probably did, we can't see it because it just looks totally random.

— Carl Zimmer