WEBVTT

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For thousands of years the Magical
Dragon of Knowledge has been teaching

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those in need. He has worked with
scientists throughout the ages but the

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question still remains. Who will the
dragon help next?

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Hey, Toni. Hey, Alex.

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Are you glad it's finally warmed up around here?

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The air feels so nice.  I'm so
glad it's mostly oxygen.

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Actually, that's a common misconception.

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The atmosphere isn't actually mostly oxygen. It's actually mostly

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nitrogen.  But I see what you mean.
Fresh air is refreshing.

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Alex, you gotta be kidding me.

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The air has to be mostly
oxygen or else we wouldn't be alive

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right now.
Come on, Tony, it's not that hard to wrap

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your head around. The atmosphere is
mostly nitrogen. Man, I really wish

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there's some mythical creature that
could explain this all to me.

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Whoa! It's the Magical Dragon

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of Knowledge.

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Well Tony, your friend Alex
is correct. The Earth's atmosphere is 78%

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nitrogen and only 21% oxygen, with the
most of the last 1% of the atmosphere

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being argon as well as some water vapor.
This means that there is almost three

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times as much nitrogen in the air then
there is oxygen. Wait, then how do we

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breathe and why is there so much
nitrogen in our atmosphere?

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Fortunately, Tony, we don't need that much oxygen

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and
nitrogen is extremely important too.

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Nitrogen is actually a pretty important
structural component of proteins.  The

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levels of nitrogen in the atmosphere
doesn't fluctuate because the nitrogen

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cycle returns all the nitrogen that's
used up back into the atmosphere.

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Wow, I was so uneducated. Thank you so much Magical Dragon of Knowledge.

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See, Tony, this is why you need to pay more attention in class, and go to more reliable sources

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like nasa.gov.

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Whoa! Where'd he go?

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Bye Magical Dragon.  Bye.  Wherever you are...