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Fix duplicate entry in history
Thanks @OzTK for the fixes.
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@@ -21,17 +21,6 @@ addition to our planet, so young that we made our first appearance on
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the evening of December~31. It seems that humans managed to arrive just
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in time to join the celebration at the end of the year.
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The story of sourdough bread begins in ancient oceans. These oceans were the
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birthplace of all Earth's life. To better envision the vast history of
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our planet lets create a timeline of 1~year. On this scale, January~1 signifies Earth's
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formation 4.54~billion years ago. Midnight on December~31 is our present.
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Each day represents roughly 12~million years. This technique simplifies the
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complexity of time but also renders the extraordinary expanse of our planet's
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history into a more graspable frame. We humans are in fact a recent addition
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to our planet, so young that we made appearance on the evening of December~31.
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It seems that humans managed to arrive just in time to join
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the celebration at year's end.
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On March~25, the oceans birthed the first single-celled bacteria. In these
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waters, another single-celled life form, \emph{archaea}, also thrived. These
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organisms inhabit extreme environments, from boiling vents to icy waters.
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@@ -47,7 +36,7 @@ organisms inhabit extreme environments, from boiling vents to icy waters.
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\end{center}
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\end{figure}
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Whoever comes first first, bacteria or archaea, remains debated. For three
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Whoever comes first, bacteria or archaea, remains debated. For three
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months (or approximately 1.1~billion years), these life forms dominated
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the oceans. Then, on June~25 in an highly unlikely event, an archaeon consumed a bacterium.
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Instead of digesting it, they formed a symbiotic relationship. This led to the
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