Shadowing Practice: Testing if Sharks Can Smell a Drop of Blood - Learn English Speaking with Video
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- I texted this clip to my wife who wanted proof I wasn't doing anything stupid on a recent trip to The Bahamas.
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Now, if you're wondering what my feet are doing in shark infested waters with a bucket of blood 20 miles away from any land, well that comes down to a conversation I had with my friends at the Discovery Channel six months ago.
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They told me Shark Week is coming up and they wanna know what I would do if they could put me in the middle of the ocean on a boat surrounded by sharks.
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For as long as I can remember, I've always wanted to test if sharks can really smell a drop of blood in the water from a mile away.
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Now, before you say MythBusters already did this, they, kind of, did this.
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As you can see, to test this they poked their fingers and then stuck them in a barrel with these tiny lemon sharks.
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And since they didn't really seem to turn around and look at their fingers, they said it was busted.
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Now, I'm friends with both Carrie and Adam, but I think even they would've been, at least in this case, the methodology was less than scientifically rigorous.
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So I came up with a more robust test procedure, built some NASA grade hardware for the experiment, hopped on a plane, and then a speedboat, and soon enough I was 20 miles offshore at the Bahamas.
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What's up? - Hey Mark.
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Dude, there's sharks.
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- There's sharks. We have sharks.
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- That's the first time I've ever seen a shark, like, in the wild.
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Let's do some science.
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To kick things off, I sat down with my marine biologist, shark diving expert, friend, Luke Tipple, and explained my plan to him.
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Eventually, I plan to test just how far they could smell a single drop of blood in the water.
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But first I wanted proof that they actually preferred blood over any other scent.
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So for my first experiment, I plan to put four surfboards in the water equal distant from the back of the boat.
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Each board would host two liters of a different liquid that we would pump into the ocean over the course of an hour.
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Then using a three meter radius around each board as a gauge, we would use drone footage and count how many sharks went over to check out each board.
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So this board would be fish oil, which I heard was a general attractant for lots of fish.
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Then we would have cows blood here.
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Then seawater here as a control to make sure the sharks weren't just interested in the surfboard.
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And then finally urine.
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I've heard from surfers that a lot of them won't pee in their wetsuits 'cause they feel like it's gonna attract a shark.
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- I don't know a surfer alive who doesn't pee in their wetsuit.
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But yes, that's definitely something I've heard a lot.
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- Gonna liberate surfers everywhere when we show that it's cool to pee in your wetsuit.
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And so after a bit more discussion, Luke was on board for the first of our two experiments.
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Well, as a firm believer in the scientific method, we'll test it out.
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- And then you dive?
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- Well, depending on the results I dive.
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I can't pee, the deals off.
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And so with that, we started putting the four boards together.
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We also started collecting scientific donations from the crew.
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- All right, so, now it's time to fill these bags.
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What do you wanna do first? Pee or blood.
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- Yeah, I do. Let's do pee.
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- Okay. - Let's do rock paper scissors for who holds the bucket and who holds the bag.
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- Okay. Wait, wait. - We'll do three shoots.
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I gotta strategize.
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Okay, I know what, I know what it is. Ready?
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One, two, three, shoots.
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Yeah! - Damn it.
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Oh, that smells so bad. It's urine.
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Whose ever it is they need to hydrate.
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Dude, this is gonna be a nightmare.
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- Oh. Oh, it's warm.
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Oh dude, it's all over my hands.
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You're pouring sucks. Oh!
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- Okay. - Ugh, that stinks.
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- No, we're good, we're good.
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All in the name of science.
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- It's a great time of day to be doing this 'cause we have a lot of sharks.
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Looking down here we got three or four lemons on the surface and I can actually see two tigers down on the bottom.
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And that's actually a massive tiger shark down there.
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- That is huge.
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All right, see if you can do a better job pouring than I did.
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Oh my gosh. Oh wow.
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There's a feeding frenzy.
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Ah! - Don't move it. It's fine.
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What do you mean don't move it?
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I almost lost my hands.
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- You did not.
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It's not gonna jump out of the water.
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- Okay, so you've got seawater as our control, fish oil...
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- Have urine and cow's blood.
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- Let's do it.
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So, while Luke is bravely swimming the four surfboards out and anchoring them in place in preparation for the one hour countdown, now is a perfect time to explain the cool tech on each board I designed and built from scratch with my buddy Sean Hodges.
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For this experiment to be robust, all four boards need to start pumping at the exact same time after Luke has them in place.
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That means we need to somehow start the pumps using a radio signal from the boat.
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So, each surfboard has a waterproof receiver box like this that also hosts the battery, a custom printed circuit board and two Arduinos.
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Then I have the remote control and as soon as I hit this button...
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They all start pumping at the same time.
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We know each pump is working because the corresponding yellow light is lit up.
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That's important because they're too far away from the boat to see if they're functioning properly.
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To pump the blood and pee, we're using a peristaltic pump.
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This is a perfect choice because it's a totally sterile way to get the blood from the bag to the ocean since the blood never touches any sort of valve or something.
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It just has these rollers that sort of pinch and push the blood through the tubing in a manner that just happens to be similar to a severed artery.
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And so with the boards in place, it was go time.
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Operation shark bait test thing commence!
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Three, two, one, beep.
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All four are going. We have confirmation.
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Everything is rolling, the experiment is underway.
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We'll let them go for an hour just dripping stuff out, and yeah, we'll see what happens.
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- Okay Mark, I can confirm that all four boards are working great.
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I can see a blood trail as far as my eye can see on the blood board.
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I'm going head back to the boat just so I'm not a variable in this experiment.
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- And after 10 minutes, I was really surprised there wasn't a lot of action on any of the boards.
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So, so far it's pretty interesting.
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I mean, we've shown if you have a massive cut and you're bleeding out and there's this many sharks within, like, 50 yards of you that they're, kind of, like meh.
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So, like, already, that's an interesting finding, right?
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You'd think a little bit of blood and there'd just be a massive swarm, but that's not the case so far.
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And to be clear, we weren't dealing with small quantities here.
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The human body contains five liters of blood.
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And after you lose two liters, which is the exact amount we're putting in the water, then you die.
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About 20 minutes in, things were still pretty quiet especially at the fish oil, urine and control boards.
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But then the blood board started attracting some smaller fish and soon after one or two sharks started taking notice.
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Not a lot of love for my pee.
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I don't know why I find that kind of offensive but I'm just a little hurt.
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Eventually, with about 15 minutes left, things started getting pretty wild over by the blood board.
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The blood was spread out and made almost like a blood runway.
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So you have this surreal line of sharks swimming up this enticing blood trail one after another, only to be super disappointed to find a big piece of styrofoam.
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We're almost done.
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Three, two, one.
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The motors have stopped.
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Our experiment is done.
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I'd just like to point out the bags have been sucked dry.
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So, the engineering part of this experiment works flawlessly.
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- Dude, there's sharks everywhere.
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- Are you serious?
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- Yeah. - There are two super pissed off tigers.
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- And so now it's time to go in and review the footage and get a final tally for each board.
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And what we found was that four sharks went to check out the fish oil, then zero sharks went to check out both the control and the urine.
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And then the blood board had a direct visit from a whopping 41 sharks.
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And so now that we debunk some surfing myths about urine and proved that sharks certainly had a strong preference for blood over anything we tested, the real question was just how much blood is interesting to them.
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And there was one part of the experimental design that was really nagging at me.
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'Cause that was cow's blood, right?
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- That was cow's blood.
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You wanna do human blood?
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- I wanna try human blood.
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- We've got at least 10 living breathing blood bags around here.
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- It's worth noting, not everyone was as stoked as Luke and I about this idea.
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Yeah, and then just draw it.
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We'll just have fresh blood, just mainline it and put it in the water.
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- Why not? Would you be down?
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- I'd be down.
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- Moondog, what do you reckon?
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- Don't look at me man.
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- You can have all the pee you want.
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You can't have my blood.
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- So Luke made some calls and soon enough we had an amazing, certified Bahamian phlebotomist on board.
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- I'm like, oh, I'm totally cool and, like, pop the ball.
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And after some generosity from the camera crew and even Captain Scotty, we had four bulging bags of human blood for our second experiment.
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This is my actual blood.
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We're gonna see if sharks have a taste for it.
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And if they do, I probably won't go free diving with them.
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For the second experiment, we had three boards.
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Again, we placed the control in the middle.
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The board over here would pump the human blood slowly at one drop a minute, and then on the other side, this board would pump the blood fast, on average one drop every four seconds.
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We were able to do that because another cool feature for the boxes we built was that by turning this knob you can control the flow rate so over time they can pump out different amounts.
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And because sometimes we all have to step up and just do our part while Luke, once again, risked his life by placing the three boards, I prepared to push a button.
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Three, two, one, commence!
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All right. All of them are pumping and good to go.
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Now the clock's just ticking.
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We have like 55 more minutes to go.
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We'll see if the sharks notice it.
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One drop of human blood every four seconds may sound like a lot and it certainly is, but it's also important to note, that's 40 times less than the first experiment where we saw so much activity.
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In this case, halfway into experiment number two, even though there were tons of sharks still in the area, the boards themselves were pretty quiet.
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We'll have to see when we look at the footage afterwards, But so far, it looks like the answer's no.
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Five, four, three, two, one, experiment's over.
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And so after the full hour, we brought in the boards and once again reviewed the footage to see that over the course of an hour, zero sharks checked out the control board, zero checked out the slow blood pumping board, and exactly zero sharks checked out the fast one.
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So this was by no means a perfect experiment.
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But I think it's safe to qualitatively say, that if no sharks came to checkout 15 drops of human blood a minute in the middle of shark infested waters, you're probably gonna be okay with a small scrape.
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I mean, there certainly won't be some kind of feeding frenzy with a single drop of blood from all sharks within a mile.
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Now that I had some firsthand data to put my mind at ease I was willing to try diving with the sharks without a cage, but I had one final experiment.
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I had a theory that if we secured a 360 camera to the front of a hand spear and then shot it near some sharks we could create the world's first really cool matrix like underwater bullet time effect.
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So I suited up and got in.
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- This is terrifying.
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And my theory proved correct on the bullet time hand spear.
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Because as you can see, that footage turned out really cool.
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Oh, he's got it!
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Oh gosh! Oh my gosh.
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Holy crap! Oh gosh, I'm gonna die.
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Save me Luke.
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They can sense I'm a newb. I know it.
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They know I'm a newb.
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- On that note, should we call it a day?
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- Let's end on that.
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That was amazing, man.
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You got 'em in like a feeding frenzy at the end.
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There's like six of 'em all around us and I lived.
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I mean, this is shaping up to be a great day.
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- What I'll take home from this shoot is just more evidence of the amazing animal that sharks are but also the ability to point people in a specific direction to say, "Hey, your thoughts about them are a little overblown." - This experience definitely changed my perception on sharks.
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I would say I respect them more after seeing their raw power up close, but at the same time, there's less of that fear that comes from ignorance.
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On top of all that, I didn't die.
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel B2 se basa en el vídeo “Testing if Sharks Can Smell a Drop of Blood”. Las palabras que más se repiten: blood, shark, board, experiment, pee. Este vídeo tiene 176 frases y 2353 palabras para practicar shadowing. La parte hablada dura 12:59. El hablante habla rápido, unas 181 palabras por minuto, así que espera sonidos enlazados y reducidos. Solo el 81 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| urine sustantivo | /ˈjʊɹɪn/ | orina, micción |
| dive verbo | /daɪv/ | bucear, somorgujar |
| surfboard sustantivo | /ˈsɝfˌbɔɹd/ | tabla de surf, tabla hawaiana |
| gosh | /ɡɑːʃ/ | Dios mío, caramba |
| frenzy sustantivo | /ˈfɹɛnzi/ | frenesí, manía |
| surfer sustantivo | /ˈsɜː(ɹ)fə(ɹ)/ | surfista, surfero |
| wetsuit sustantivo | /ˈwɛtˌs(j)ut/ | traje acuático |
| seawater sustantivo | agua salada | |
| commence verbo | /kəˈmɛns/ | incoar |
| spear sustantivo | /spɪə̯(ɹ)/ | lanza, venablo |
| robust adjetivo | /ɹəʊˈbʌst/ | robusto |
| bucket sustantivo | /ˈbʌkɪt/ | balde, cubeta |
| pour verbo | /poɹ/ | escanciar, echar |
| lemon sustantivo | /ˈlɛmən/ | limón, citrón |
| biologist sustantivo | /baɪˈɒləd͡ʒɪst/ | biólogo, bióloga |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| check out verbo | investigar, chequear |
| come up verbo | salir a relucir |
| come up with verbo | ingeniar, ingeniarse |
| point out verbo | señalar, apuntar |
| step up verbo | aumentar, redoblar |
| turn around verbo | darle una vuelta, dar(se) una vuelta |
| turn out verbo | resultar |
Frases que vale la pena repetir
Frases cortas y completas del vídeo que puedes reutilizar en la conversación diaria:
- I can't pee, the deals off.
- What do you wanna do first?
- What do you mean don't move it?
- You wanna do human blood?
- Would you be down?
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | I've always wanted · I've ever seen · I've heard |
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | was busted · is lit · was spread |
Pronunciación a tener en cuenta
El hablante usa 71 contracciones y formas reducidas, como I'm, gonna, we'll. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “th”: methodology /ˌmɛθ.əˈdɑ.lə.d͡ʒi/, myth /mɪθ/
- Los sonidos de “sh” y “zh”: gosh /ɡɑːʃ/, offshore /ɒfˈʃɔː(ɹ)/, donation /doʊˈneɪʃən/, confirmation /ˌkɑn.fəɹˈmeɪ.ʃən/, perception /pɚˈsɛpʃ(ə)n/
- Palabras largas — cuida el acento: biologist /baɪˈɒləd͡ʒɪst/, peristaltic /ˌpɛr.əˈstɒl.tɪk/, scientifically /ˌsaɪ.ənˈtɪfɪkli/, generosity /ˌd͡ʒɛn.əˈɹɑ.sə.ti/, methodology /ˌmɛθ.əˈdɑ.lə.d͡ʒi/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: spear /spɪə̯(ɹ)/, scrape /skɹeɪp/, speedboat /ˈspidˌboʊt/, sterile /ˈstɛɹəl/, strategize /ˈstɹætəd͡ʒaɪz/
- /v/ — no es /b/: los dientes tocan el labio inferior: dive /daɪv/, bravely /ˈbɹeɪvli/, believer /bɪˈlivɚ/, receiver /ɹəˈsi.vɚ/, variable [ˈvæɹ.i.ə.bl̩]
- /z/ — sonora, no /s/: frenzy /ˈfɹɛnzi/, strategize /ˈstɹætəd͡ʒaɪz/, scissors /ˈsɪzəz/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como urine, dive, surfboard.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.