シャドーイング練習: 5 Easy At Home Science Experiments w/ Mark Rober - 動画で英語スピーキングを学ぶ
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Today we're going to do five at home experiments that are very near and dear to my heart.
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And for the first time ever, we're sharing the recipe for our favorite bit of chemistry called elephant's toothpaste.
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We've got some epic science lined up, and the coolest thing is that all of them can be easily done at home yourself.
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Whoa, whoa, Bob, whoa.
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First up is my childhood favorite, the egg in a bottle experiment.
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All right, science Bob Flugfelder.
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I did this at the science fair when I was in first grade.
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The main reason I liked it is because it involved fire.
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And I was allowed to light things on fire.
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I'm impressed.
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The ingredients for this experiment are very simple.
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We have an egg that's peeled, hard boiled, just like a standard milk bottle you could order off the internet.
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The neck size is very important though.
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You want it to be just smaller than an egg.
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How do you get the egg into this jar?
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Because as you can see, it can't really work.
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It breaks the egg.
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That could have been a mistake.
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There we go.
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How do you get an egg into this jar without breaking the egg and making a mess like this?
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What's the secret?
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The secret, Bob, is fire.
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First off, goggle up for safety.
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Gonna grab these papers with Tons.
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Gonna light the paper, put it in the jar, put the egg on top.
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Look at that.
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A fully intact, non -broken egg is now inside this jar.
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When air heats up, the molecules want to stretch out.
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They're moving around a lot.
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So when we light that fire, the air inside, it wants to stretch out.
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Then all the air molecules kind of suck back together, and it just pulls the egg right back into the jar.
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So now the question is, Bob, how do we get this out?
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So you have to go from a vacuum to pressure.
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We just blow into this jar, huh?
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad *
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*sad
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sad sad sad sad sad Woohoo!
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Now your challenge is to get that out, Bob.
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Oh my gosh.
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That's all we get.
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I say we got one bigger.
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Okay.
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There we go.
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There it is.
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There's the blup blup.
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Oh boy!
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Oh boy!
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Come on!
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It's coolin'.
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Wow.
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Man, we're getting so close.
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And we can't push it in either.
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No. We need to try.
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Well, wait.
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Well, can we?
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Oh.
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That's even cooler.
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So that shows you just how much this air shrinks and expands when it gets hot, right?
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It's a good start, Bob.
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Next up is Bob's favorite experiment, slime, and here's why.
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Here is a picture of me at seven years old making my first ever batch of slime.
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That is my evil scientist face.
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A lot of people know how to make slime.
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Yeah.
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There's this old craft glue.
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The secret of this is a chemical called polyvinyl alcohol.
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Now, I add just a little touch of water.
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So this is still obviously very watery.
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The next I've got Borax
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and Borax you'd actually find in the cleaning aisle I'm gonna take a teaspoon five milliliters
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And then we're gonna add about a half a cup of
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water nice thing about slime everyone's slime's a little bit different right now We got glue and water.
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Yep, Borax and water.
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Yep.
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Also important.
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You want to add your color now.
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I'm going jello pool right Bob?
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I love the jello pool.
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How much of that should I do?
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Not too much.
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Why?
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It's gonna get on your hands.
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Your hands will be red for the rest of the video.
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So you want to add it to your glue Solusion two drops.
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Yeah, let's start off - I'm doing three don't tell Bob.
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I heard that whoa you're very happy with that There are molecules in here, and they're all loose the borax is gonna bond all those
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together you want to just kind of experiment here I'm gonna take maybe a teaspoon of this
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and you can see right away look I'm doing three whatever you want Okay, but mine's like kind of goopy and runny that means
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that you still don't have a lot of bonds that have bonded so you add a little more Bonding activity.
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Whoa, so if you let it sit for just a little bit of time, it's a difference, right?
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It does.
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I like how it doesn't like Get on your hands.
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It seems like it would be sticky, but it's not.
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What if I were to add color now?
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It would be very hard to mix in right because all those bonds are made.
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Give it a try.
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My hypothesis is that Mark's hands are gonna be blue the rest of the video.
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Uh oh.
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It might be blue the rest of the week.
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That is cool.
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It looks like a blue heart.
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I I'm gonna go wash my hands.
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For at home science experiment number three, we've got a fun one.
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That's pretty simple.
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You just take a very clean plate and just put a nice little layer of water.
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Have you ever seen those water spiders that like glide on top of the water?
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The question is like why does it float on the water?
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Why does it just sink?
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We're gonna demonstrate that a little bit while I just pour a lot of pepper.
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It's on the surface.
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It's like one of those water spiders.
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of it on your finger like
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so put it wherever you want I'm gonna go right in the center I'm a magician I am a powerful wizard!
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Pepperous, Repellicus!
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Woah!
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You're a wizard, Bobby!
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What's happening here is disc soap has this special ability.
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It's called a surfagant.
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Surface tension is all the top layer of molecules in the water that are all joining arms.
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They're hanging together.
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Well, soap has the special ability to break those.
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As soon as you put soap, it rips that apart.
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And then almost like a rubber band, they all go to the side.
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And this is why disc soap is so good at cleaning things.
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like magic.
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But it's actually real.
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For experiment number four, it's super easy.
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For this, you need a clear glass and-- uh -oh.
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Whoa.
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Whoa, Bob.
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Whoa.
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So this is seltzer water.
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Put a couple of raisins in here.
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And you see how immediately we got bubbles released, right?
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All right, now put some of these popcorn kernels in.
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So far, Bob, I'm not going to lie.
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This is kind of a boring-- It's kind of lame.
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I get it.
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Now we have our dancing popcorn.
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They float.
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OK, they float.
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A dent.
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Wait, what?
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What is going on?
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that nucleate on it from the carbon dioxide.
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That's like arm floaties that are gonna float you to the top.
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And then when it gets exposed to the air, the arm floaties get popped, they sink, they get more arm floaties, they go to the top.
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So I figure let's add a variable, let's do it in something taller, right?
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I think there's no way a corn kernel will go all the way to the bottom.
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Okay, I'm dumping all these in with my blue hands, which someone didn't warn me about.
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Whoa, it's like a race to the top.
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Oh, okay, halfway, three quarters.
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Oh, go.
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Yeah, we hit the bottom.
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This is actually way more impressive in a tall cylinder.
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This is like a corn lava lamp.
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Get out of here, Bob.
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I don't know how it's gonna work.
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I haven't tried this.
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My hypothesis is that we're gonna get one that goes all the way down.
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I don't think that.
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Go, go, go, go, go, go.
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No. No. Come on, you got this.
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Oh, go, go, go.
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No. We're getting closer, dude.
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We're getting closer.
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Oh, yes.
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Experimentation and science looks and feels like you guys.
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We're just thinking of these things on the fly.
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We're curious.
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We're asking questions and we answer the questions.
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One question we had was which of the three containers would keep the corn moving the longest?
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And spoiler alert, it was the biggest one.
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Which had the most liquid and therefore the most carbon dioxide, or bubbles, stored up in the water.
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It's time for experiment number five.
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Bob, what is it?
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Elephant soupy.
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You guessed it.
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And this is an experiment, just like all these, that you should definitely be doing with a parent or some kind of adult.
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So let's start with our hydrogen peroxide.
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We're gonna do six ounces.
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I want you to get three tablespoons of warm water.
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There we go.
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To that, we're gonna add one tablespoon of the dry yeast.
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- Okay.
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- Now, I'm gonna have you mix that up.
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- Okay, it's a little like hydrophobic, or meaning it doesn't mix well with water, unless you really try.
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- So while we let that kind of mix a little bit, I'm gonna go with a good squirt of our dish soap, maybe like a tablespoon.
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And finally, some color, classic red.
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Okay, so let's review.
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In here, we have our hydrogen peroxide, liquid soap, and we have our coloring.
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- Yes.
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- In here, we've got our yeast and warm water.
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And then the last step is to mix them together.
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It's a catalyst.
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It's gonna speed up a reaction that's already happening.
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There we go.
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Okay, ready?
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Ready.
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Pouring, pouring, pouring, pouring.
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Whoa, here it comes, Bob.
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Wow, it's so smooth.
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It looks delicious.
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Very laminar.
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Oh, that's so beautiful.
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Whenever I smell this, it brings back so many fond memories.
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We ran so many experiments trying to get the right combinations
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and we just weren't getting as much volume as I wanted
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So I called up science Bob told me exactly what you're doing and you weren't using warm water
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Variable we weren't considering why do you think warm water does the trick formula for water is H2O right?
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So here's my little model.
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So this is your H and that's your two O's right?
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So you got H2O got it with hydrogen peroxide.
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It's H2O2 It hugs up with one of the other O's that pulled apart and now we've got oxygen and water.
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This is why you want the right amount of catalysts to pull these off.
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If you don't have enough, maybe only half of the hydrogen peroxide molecules get ripped off like this, right?
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So many experiments.
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All right, so that was the at -home version.
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That's right.
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Now this is 30%, which is why we have got our goggles on, we have got our gloves on.
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And for the first time ever, I'll say why Bob pours this in.
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In the video description, we are putting the recipe for this version of elephant toothpaste.
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The trick is you gotta do it with the science teacher.
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'Cause only a science teacher will be able to get this 30 % hydrogen peroxide.
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Plus it is more dangerous, so.
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- Don't wanna do it in your kitchen.
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- Or your bedroom.
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- What in the world?
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That's my office.
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- Okay, great.
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Three tablespoons.
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Now we have soapy hydrogen peroxide.
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- In honor of elephant juice based 3 .0, I say we'd agree.
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- Believe that got us a Guinness world record.
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And now our catalyst is no longer yeast.
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using a chemical called potassium iodide.
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- Your science teacher will get easy access to it.
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- We saw the home version, let's do the television version.
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- Television version, here we go.
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- I'm gonna give you the honors.
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There it is.
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And you step back.
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Woo!
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Ho ho ho ho ho!
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We had discussed moving it away from Skate's Drop.
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- Here you go.
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Uh -oh, Bob.
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- Here comes the big one.
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- Whoa!
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- It is definitely warm.
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- Yeah, so this is an exothermic reaction, which means it gives off heat.
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Definitely don't wanna touch this phone.
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- Yeah.
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- And you also notice that it's got these brown highlights.
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- Yeah, what's up with that?
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- So that's the iodine from the potassium iodide, which is brown.
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Let's add one more variable just to see what happens.
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- Okay.
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- Version three.
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Again, we're just adding a variable.
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- And ideally, you just change one variable.
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In science, the reason you change just one variable is now if the result is different, you know it's because of that variable.
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The result will be different.
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You don't know which caused it.
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If this looks different, we know it's because of the container.
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We are using glued food coloring because we haven't used glue yet.
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Same catalyst, same amount. And it goes.
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Oh!
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I was not expecting that.
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Wow.
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It just plopped out, Bob.
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And a lovely blue coloring.
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We got our gloves on, but it's still hot.
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I can feel the heat on that.
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- Ooh, yeah, that's really warm.
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Even through the gloves, you can feel the warmth.
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- So even if you do a home version, find a variable and experiment.
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- And change it and get it to look as cool as possible.
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The most important words in science aren't eureka, That's interesting.
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'Cause you do stuff that you're like, whoa, I wasn't expecting that.
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So let us know in the comments what experiments you wanna see us do next.
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If you try 'em yourself, of course, tag us on our socials at Crunch Labs.
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We'll catch you next time, right here at Crunch Labs.
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Bye.
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このレッスンについて
「5 Easy At Home Science Experiments w/ Mark Rober」を使って、シャドーイングで英語を練習しましょう。
毎日15〜30分の練習で、IELTSスピーキングへの自信と実践的な英会話力が身につきます。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。