Prática de Shadowing: Invisible ink science experiment - Aprenda a falar inglês com vídeo
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Has your kid ever wanted to be a spy or maybe write secret coded notes to their siblings or their friends?
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Well, today I have an experiment for exactly that called secret friendship notes.
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Hi everyone, I'm Emily Calandrelli, MIT engineer and host of Emily's Wonder Lab.
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And on my channel, we learn about all things space and science.
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So grab some turmeric because we are about to go on a mission.
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Keep exploring.
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And this sounds like.
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Skate carrier.
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And keep exploring.
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Today for our secret friendship notes, we are going to draw a secret message with a baking soda solution, set it aside to dry,
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and then once it's dry, we are going to reveal it with a turmeric solution.
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Okay?
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So for our baking soda solution, what you need is one cup of water plus one tablespoon of baking soda.
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To draw your message, you'll want a few paintbrushes, and then later for your turmeric solution,
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you want one half cup water with one teaspoon of turmeric.
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And parents and adults, if you've worked with turmeric before, you know that it stains everything.
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Fingers and counters and bowls and basically anything it touches.
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So please exercise caution here.
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It is why I have my tinfoil on the counter because I'm trying to save this counter from the turmeric.
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So just be careful here.
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So first, we are going to make our baking soda solution.
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This is going to be our paint that we paint the secret message
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that you're not going to be able to see after it dries.
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So let's go ahead and do one cup of water.
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Right in a bowl.
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And now, let's add one tablespoon of baking soda.
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Just like this.
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And then go ahead and mix it up.
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You'll notice that the baking soda won't completely dissolve in the water, and that's okay.
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If you have a little bit of baking soda on the bottom, that's all right.
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We're just trying to create as much of a baking soda solution as we can
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because it's the baking soda that is the very key ingredient to our secret message here.
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Once you've mixed that up about as good as you can, we're going to take our paintbrush and use this
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and our baking soda solution to write our secret message on a piece of computer paper.
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So I'm going to take one sheet of computer paper here,
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set this aside and write my message here trying to get as much baking soda on your paintbrush as you can.
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Tap it off.
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You don't want it to be too wet.
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Okay, now that I've written my secret message, I'm going to set it aside to dry.
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It'll take between 10 minutes to an hour, really depending on how much water you use on your paper.
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But if you want this message to be completely secret,
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You want it to be completely dry because once it's completely dry because the baking soda is white
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It's so hard to see this is the secret part of these secret friendship notes
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So try to let it completely dry before you move on to the next step
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Once your secret friendship note is dry
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You can give it to a friend with the magic reveal paint and the magic reveal paint is our turmeric solution
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So let's go ahead and make that we're going to do one half cup water there plus plus one teaspoon turmeric.
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I'm using my one half teaspoon here because it fits in the turmeric because I'm just trying to avoid spills here.
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One half teaspoon plus, plus one half teaspoon equals one teaspoon.
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I'm gonna go ahead and mix this up.
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Again, it'll be a little clumpy.
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This is because turmeric is not soluble in water.
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It's soluble in alcohol, but we're just gonna do our best here.
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We just wanna suspend the turmeric in the water as best we can.
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Now here's the fun part.
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So we're going to take our turmeric solution
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and with a big paintbrush you're going to tell your friend
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that to reveal the secret message they just need to paint the paper with the magic reveal paint.
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You just want to go ahead and paint the entire thing.
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I'm going to take my secret message here and I'm just going to paint on top of it.
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Because look at this.
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It's very hard to see what this says.
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Right?
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What is my secret note saying?
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I don't know.
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Let's reveal it.
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Here we go.
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Look at that.
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Look at the turmeric reacting with our baking soda here.
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Do you see what's happening?
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Look at this.
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Everywhere that our turmeric is touching the paper, it's yellow, kind of what you would expect, like the color of turmeric.
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But when it touches the part where we had baking soda, do you see the color it turned?
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It turns red.
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Why does that happen?
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Well, it's because turmeric is something known as a natural pH indicator.
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which means it changes colors when it's in the presence of an acid and a base.
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What is baking soda?
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Well, it's sodium bicarbonate or a base.
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And so when turmeric interacts with baking soda, it turns red.
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It goes from yellow to red to indicate that it is in the presence of a base.
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Here's a trick to make your secret note even more secretive use cardstock
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because cardstock doesn't absorb the water as much so you don't have those obvious ripples in the paper.
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It takes a little longer for the water to dry but once it does it's even harder to see your message.
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So let's go ahead and reveal this one.
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Get my turmeric secret reveal paint on my paintbrush.
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Watch with each brush stroke I'm revealing a part of my secret message.
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You see what it says here?
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It says, Stay curious and keep exploring.
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You send your friend this message, but they have no idea what it says.
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You tell them to reveal it with your magic turmeric paint.
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Let's see.
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You see what it says?
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Meat in the treehouse.
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Home.
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And the best part is that your secret friendship note smells amazing.
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Very spicy.
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Smells great.
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Thank you for making secret friendship notes with me.
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If you like this one, be sure to check out my bestselling
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Stay Curious and Keep Exploring book series for 99 more science experiments.
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I'm Emily Calandrelli.
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Subscribe for all things science and space.
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And remember, stay curious and keep exploring.
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I'll see you next time.
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Emily's Science Lab
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação usa o vídeo “Invisible ink science experiment”. As palavras que mais se repetem: secret, turmeric, baking, soda, message. Este vídeo tem 106 frases e 1095 palavras para praticar shadowing. A fala dura 7:15. O falante fala em ritmo natural, cerca de 151 palavras por minuto, próximo de uma conversa do dia a dia. 83% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.
Vocabulário principal deste vídeo
15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| soda substantivo | /ˈsoʊdə/ | soda cáustica |
| bake verbo | /beɪk/ | assar |
| reveal verbo | /ɹɪˈviːl/ | revelar |
| friendship substantivo | /ˈfɹɛn(d)ʃɪp/ | amizade |
| explore verbo | /ɪkˈsploɹ/ | explorar |
| curious adjetivo | /ˈkjʊɹ.i.əs/ | curioso |
| experiment substantivo | /ɪkˈspɛɹ.ə.mənt/ | experimento, experiência |
| finger substantivo | /ˈfɪŋɡɚ/ | dedo (da mão) |
| trick substantivo | /ˈtɹɪk/ | artimanha, truque |
| acid substantivo | /ˈæsɪd/ | ácido |
| sheet substantivo | /ʃit/ | folha |
| indicate verbo | /ˈɪndɪˌkeɪt/ | indicar |
| carrier substantivo | /ˈkæɹi.ɚ/ | carregador, portador |
| brush substantivo | /bɹʌʃ/ | brocha, escova |
| depend verbo | /dɪˈpɛnd/ | depender |
Phrasal verbs que você vai ouvir
| Palavra | Pronúncia | Significado |
|---|---|---|
| go ahead verbo | /ˌɡoʊ əˈhɛd/ | vai em frente |
| check out verbo | verificar, sacar só |
Frases que vale a pena repetir
Frases curtas e completas do vídeo que você pode usar na conversa do dia a dia:
- You don't want it to be too wet.
- What is my secret note saying?
- Do you see what's happening?
- You see what it says here?
- You see what it says?
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | you've worked · I've written |
| Verbo + -ing enjoy, keep, stop… + -ing — verbos seguidos da forma em -ing | Keep exploring |
| Superlativos the -est / the most … — o maior ou o menor de um grupo | our best · the best |
| Futuro com “going to” be going to + verbo — um plano ou algo que dá para prever | are going to draw · are going to reveal · are going to make |
Pronúncia para ficar de olho
O falante usa 34 contrações e formas reduzidas, como I'm, we're, don't. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: friendship /ˈfɹɛn(d)ʃɪp/, sheet /ʃit/, brush /bɹʌʃ/, caution /ˈkɔːʃ(ə)n/, paintbrush /ˈpeɪntˌbɹʌʃ/
- Palavras longas — acerte a sílaba tônica: experiment /ɪkˈspɛɹ.ə.mənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, ingredient /ɪnˈɡɹiːdi.ənt/, bicarbonate /baɪˈkɑɹ.bə.neɪt/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: bake /beɪk/, friendship /ˈfɹɛn(d)ʃɪp/, experiment /ɪkˈspɛɹ.ə.mənt/, trick /ˈtɹɪk/, acid /ˈæsɪd/
- /l/ final — a língua toca o céu da boca, não vira “u”: reveal /ɹɪˈviːl/, spill /spɪl/, soluble /ˈsɑljəbəl/, ripple /ˈɹɪp(ə)l/
- s + consoante no início — sem um “i” antes: spill /spɪl/, spicy /ˈspaɪsi/, skate /skeɪt/, stain /steɪn/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como soda, bake, reveal.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.