Using the principle of similar triangles to measure tree height

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shuigebuhuang

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0:53

Primary Colors and Mixing

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0:30

The roof seems to be leaking.

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1:05

You could go perform magic now.

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1:10

This is a bit outrageous.

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1:00

I spent ages trying to figure it out, but still couldn't understand.

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1:04

It turns out you can actually play with the big ice chunks inside popsicles like this.

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1:05

How do these bubbles stay suspended?

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1:21

This is how the old-fashioned hand pump well actually works.

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1:07

How do you calculate this?

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1:10

This glass of water belongs to a chameleon.

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0:58

Looks like we can save the money for buying speakers.

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1:09

You'll never know how much psychological pressure chess players endure.

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1:14

Everyone, please don't blindly follow trends and imitate others.

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1:56

Today, nothing seems to go right.

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1:07

It's still a bit hard to believe.

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1:11

Today, the secret of the dogtail grass was finally revealed.

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0:47

This is way too scary.

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0:48

Magical chemical reactions.

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0:35

This works too?

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0:50

I wanted to install an air conditioner at home for my child, but who would have guessed...

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