Fix duplicate entry in history

Thanks @OzTK for the fixes.
This commit is contained in:
Hendrik Kleinwaechter
2023-11-30 22:21:09 -05:00
parent a09d94d7df
commit eeebc364e8

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