Sea Level

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These short YouTube videos make it very easy to learn things.  You might not get a quality education.  And you might get more of a cliff’s notes version, but you learn things.  And if it’s interesting for you, you can use it to learn more about things in general.

Such is the case surrounding trying to figure out what “sea level” is.

Or you can also watch this video that explains why rivers have bends:

{reddit}

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