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I'm thirty-six years old and I've been married once and he left and I don't want to feel this way anymore. Like I can't be vulnerable. Can't relax. It's exhausting, always being on the defensive, keeping my guard up. I feel like Cuba.

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Mark Stoneking

D. N. A. sequences change by mutations, and the idea behind the molecular clock is that those changes occur at, more or less, a constant rate, over time.