쉐도잉 연습: How is glass made? - 영상으로 영어 말하기 배우기

Hi, it's Doug.

I recently came across this unbelievable video.

It was taken at a hotel in Texas where on the roof of the hotel they have this pool

that hangs off the edge and it has a glass bottom.

Look at this.

Would you go in there?

Would you trust this glass?

Someone named Benjamin has a question about glass.

Let's give him a call now.

Hi, Doug.

Hi, Benjamin.

I have a question for you.

How is glass made?

That's a great question.

It's funny, right?

Think about just how many objects around you are made of glass.

Without glass, we'd have no windows, no windshields for our cars, no No drinking glasses or eyeglasses.

No skyscrapers or smartphones.

And yet, it's really not obvious at all where glass comes from.

Like if you're sitting there and you have a table or a desk in front of you like this, that's wood.

I'm guessing you know that wood comes from a tree.

Or this statue here is carved from stone.

You know where that comes from. But glass?

Glass is a material that has to be made.

How do they make it?

Where does it come from?

Before I say anything more, now would be a good time to pause the video and discuss.

Okay, you ready?

Well, believe it or not, Glass is made by taking a bunch of sand and getting it so hot that it melts.

It's one of the most amazing things to watch how it's made because in order to melt sand, you have to use a special type of oven that can get super hot.

It's called a furnace or a kiln.

Here you can see someone loading some sand into the furnace.

Once it gets hot enough, it will melt or become liquid.

And when you get something this hot, you can see it glows, just like lava.

This isn't lava though, it's molten sand.

And as it cools, it will start to look more familiar to you.

It becomes solid glass.

To make a flat sheet of glass, like you'd use for a window, they melt sand until it's molten.

Then they pour it out and roll it into a flat shape like this, and carefully allow it to cool.

More fancy objects, like a glass vase, are even more fun to watch.

This involves a special skill called glass blowing.

You can see here, it starts with this person taking a big glob of molten sand

and getting it on the end of a hollow pipe.

Then she blows air into the pipe.

You can actually blow a bubble into it, which might end up being the open part of the vase.

The molten glass has a similar thickness as honey.

They carefully shape it the way they want it and keep turning it and turning it.

As it cools, it becomes solid.

Artists can make amazing sculptures with glass.

Believe it or not, this artist is making a glass swan.

So that's how glass is made.

But it's kind of weird, isn't it?

I mean, how did people ever discover that if you melt sand, it makes glass?

We've been making glass for a long time.

So long ago now that no one knows for sure who was the first person to discover

that if you melt sand it makes glass.

But some of the earliest objects made of glass come from ancient Egypt, a place covered in desert sand.

Could it be that someone long ago had a campfire

and noticed that the heat of their fire melted the sand beneath it?

No one knows for sure, but it's possible.

That's all for this week's question.

Thanks Benjamin for asking it.

Now for the next episode, there's a lunar eclipse that's going to happen.

I reached into my question jar and chose three questions about lunar eclipses that I'm thinking about answering.

When this video is done playing, you'll get to vote on one.

You can choose from, what's the difference between a solar and lunar eclipse?

Why does the moon turn blood red during a lunar eclipse?

Or where does the word eclipse come from?

So submit your vote when the video's over.

I wanna hear from all of you watching.

There are mysteries all around us.

Stay curious and see you next week.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

쉐도잉 연습: How is glass made? - 영상으로 영어 말하기 배우기

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