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Watch This When You're High - The Cambrian Explosion

Thanks to @edharley for this suggestion.

For most of the Earth's history, life consisted of the simplest organisms; but then something happened that would give rise to staggering diversity, and, ultimately, life as complex as that which we see today. Scientists are still struggling to figure out just what that was.

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Keep the suggestions coming. Keep them classy. No butt stuff.