0:00:00.706,0:00:02.206
Right now, somewhere out there,

0:00:02.231,0:00:05.269
an educator is delivering[br]a mind-altering lesson to their class.

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I want to engage your brains in this.

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Chris Anderson: I tried to get[br]my head around how vast our Earth is.

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Logan Smalley: The lesson only reaches[br]the students in that room.

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What would happen if we captured it?

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It's a toothed wheel.

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LS: What if pro animators[br]and visualization artists

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could bring that lesson to life?

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CA: It's a common object[br]that literally fits one million Earths.

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It's got a bunch of notches[br]and a bunch of teeth.

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This was Fizeau's solution --

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LS: When that lesson lands,[br]curiosity is ignited.

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CA: It seems impossibly big.

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AS: Something interesting happens.

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CA: In the great scheme[br]of things, it's a pinprick.

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AS: A door closes on the light beam[br]that's coming back to his eye.

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LS: Then that group of students[br]is one thought closer

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to being what every teacher[br]hopes their students will become:

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a lifelong learner.

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AS: Based on the distance[br]between the two stations --

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CA: The quest for knowledge[br]and understanding never gets dull.

0:00:53.241,0:00:57.226
AS: He calculates the speed of light[br]to within two percent of its actual value.

0:00:57.250,0:01:00.645
CA: The more you know,[br]the more amazing the world seems.

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That's the central mission of TED-Ed:

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to capture and to amplify

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the voice of the world's[br]greatest teachers.

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He does this in 1849.

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CA: It's the crazy possibilities,[br]the unanswered questions,

0:01:12.745,0:01:14.145
that pull us forward.

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So stay curious.

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[TED-Ed: Lessons Worth Sharing]