Pratique du Shadowing: How to Make Learning as Addictive as Social Media | Duolingo's Luis Von Ahn | TED - Apprendre l'anglais à l'oral avec YouTube

So, I'm from Guatemala.

⏸ En pause

Vitesse :

167 phrases

Si les phrases sont trop courtes ou trop longues, cliquez sur Edit pour les ajuster.

So, I'm from Guatemala.

This is a public service announcement.

That is where Guatemala is.

Also, that is not where they keep the prisoners.

That is called Guantanamo.

Not the same place.

So, Guatemala is right below Mexico.

And for the Americans in the audience, and let this sink in because it really applies in most ways, and there are Americans in the audience,

you can think of it as Mexico's Mexico.

Just like the US doesn't want illegal immigration from Mexico, Mexico doesn't want illegal immigration from Guatemala.

It's a smaller country, it's a poorer country, and, well, what can I tell you?

It has much better Mexican food.

Guatemala is a very poor country, and a lot of people talk about education as something that brings equality to different social classes.

But I always saw it as the opposite, as something that brings inequality.

Because what happens in practice is

that people who have a lot of money can buy themselves a really good education

and therefore continue having a lot of money, whereas people who don't have very much money barely learn how to read

and write and therefore never make a lot of money.

And this is especially true in poor countries.

Now, I was fortunate that I received a rich person's education, even though I didn't grow up rich.

And it's because I'm an only child, And my mother, who was a single mother, spent all of her resources on my education.

And this allowed me to come to college to the US and eventually get a PhD in computer science.

Now, because of all of this, about 10 years ago, I decided I wanted to do something that would give equal access to education to everyone.

Oh, by the way, this is what I want to talk to you about today, giving equal access to education to everyone.

At the time, I was a professor of computer science at Carnegie Mellon University, and I decided to work on this with my PhD student Severin.

The way my brain works, all of education, is just too general of a problem.

So I decided, let's start by teaching one thing.

And then I started thinking, OK, well, what should we teach first?

Should we teach math?

I mean, we both loved math.

Me and my co-founder, we both loved math.

And, you know, we didn't decide to do math.

Then we started thinking, well, maybe we should teach computer science.

But eventually, and this may be surprising to people in North America, eventually we decided that the best subject to start with was teaching foreign languages.

And let me tell you why.

There's a number of reasons.

One of them is that there's a huge audience for it.

There's about two billion people in the world learning a foreign language, both in school and outside of schools.

Most of these people, by the way, are learning English.

About 80 percent of them are learning English.

In this weird map right here, are countries in which people are predominantly learning English.

And the reason for that is because English can truly transform your life.

In most countries in the world, knowledge of English can significantly increase your income potential.

So this is another reason why we decided to start with foreign languages, and it's because you can directly make more money if you learn another language, in particular English.

And see, this is pretty different than many other subjects. For example, take math.

In the case of math, just knowledge of math does not increase your income potential, because usually you have to learn math to then learn physics, to then become a civil engineer, like, that's how you make more money.

Whereas with languages, if you were a waiter and you learned English, now you can be a waiter at a hotel and make more money.

So we decided, well, let's get started by teaching languages.

Now, we also convinced ourselves that the only way to really reach a lot of people was by using a mobile phone, or a smartphone in particular.

See, building schools all over the world is simply too expensive.

On the other hand, most of the world's population already has access to a smartphone, and the trend is that that fraction is only going to increase.

So we decided at the time

that we would make a way to learn foreign languages on a mobile phone that was accessible to everyone.

And then we called it Duolingo.

Thank you.

Now, in order to truly be accessible to everyone, rich and poor, Duolingo uses a freemium model to support itself.

What that means is that you can learn as much as you want without ever having to pay.

But if you don't pay, you may have to see an ad at the end of a lesson.

Now, if you don't like ads, you can also pay to subscribe to turn off the ads. And it turns out

that the vast majority of the revenue for Duolingo comes from people who pay to subscribe to turn off the ads.

Now, who are these people who pay to subscribe to turn off the ads?

Well, they're usually people, well-off people, in rich countries like the US and Canada, who are the people who don't pay to subscribe.

They usually come from poorer countries like Brazil or Vietnam or Guatemala.

So what I like about this model is

that it is a small form of wealth redistribution

because we're basically getting the rich people to pay for the education of everyone.

So I like that.

Yes.

It's great.

So with smartphones, we can reach a lot of people, and we can even get the rich people to pay for the whole thing.

This is great.

However, if you're trying to deliver education with a smartphone, you run into a humongous problem.

And it is that smartphones come equipped with some of the most addictive drugs that humanity has ever engineered.

TikTok, Instagram, mobile games.

See, delivering education over a smartphone is like hoping that people will eat their broccoli, but right next to it, you put the most delicious dessert ever made.

If you really want to deliver education to everyone, not only do you have to make it accessible, but also you have to make it so that people want to actually learn.

And with Duolingo, we've been able to do this, and at the highest level, the way we've done this is by making the broccoli taste like dessert.

I'll say it another way.

is that we've used the same psychological techniques that apps like Instagram, TikTok or mobile games use to keep people engaged,

but in this case, we use them to keep people engaged, but with education.

Let me give you some examples of these techniques.

One of the most powerful ones is the notion of a streak.

What a streak is, it's just a counter that measures the number of days that you've used the product consecutively.

You just take that number, you put it very prominently in your product, and then people come back every day.

And the reason people come back every day is because, well, if they don't come back, that number resets to zero and people don't want to lose their streak.

It works.

Now, on the one side, streaks have been criticized for, for example, getting teens addicted to Snapchat.

But in the case of an educational app, streaks get people to come back to study every day.

Now, to give you an idea of the power of streaks, in the case of Duolingo, we have over three million daily active users that have a streak longer than 365.

That means they haven't missed a day in the last year or longer.

Now, fun fact about streaks.

What country do you think has the longest average streaks for an educational app?

It's Japan. Of course.

Shortest average streaks?

Latin America, baby. But we're fun.

Hey, we're fun.

Another important mechanism to get people to come back to your product are notifications.

On the one side, notifications can be really spammy and annoying, but in the case of an educational product, people actually want to be reminded to learn.

In the case of Duolingo, we have a very sophisticated AI system

100

that basically chooses when to send a notification

101

and also what to say in each notification to maximize the probability that people come back.

102

Now, interestingly, even after all this sophistication, it turns out that the algorithm for choosing what time to send you a notification is pretty simple.

103

Do you know what is the best time to send people a notification?

104

I'll tell you.

105

It's 24 hours after they used the product last.

106

Because there's an easy explanation.

107

If you were free yesterday at 3 p.m., you're probably free today at 3 p.m as well.

108

So this is what a very sophisticated millions of dollars of AI I found.

109

It's funny.

110

Now, with notifications, you shouldn't be spamming.

111

And we're not spamming.

112

With Duolingo, we actually stop sending notifications after seven days of inactivity.

113

So if you don't use Duolingo for seven days, we stop sending you notifications.

114

Now, at some point, it occurred to us, if we're stopping to send people notifications, we should let them know.

115

So we started sending this notification to people, saying, hey, these reminders don't seem to be working.

116

We'll stop sending them for now.

117

do when they get this notification?

118

They come back.

119

Passive-aggressive.

120

Works for my mother, works for Duolingo.

121

These passive-aggressive notifications are really good at getting people to come back

122

because they feel like our green owl mascot has given up on them.

123

So they come back.

124

And speaking of our green owl mascot, by the way, because all our notifications come from our green owl mascot, and, well, he's passive-aggressive and also pretty pushy, this has given rise to a lot of memes on the internet

125

that make fun of just the great lengths that he will go through to get you back to learn a language.

126

Here's one of my favorite ones.

127

It's a meme, it's one of my favorite ones.

128

It's basically, looks like you forgot your Spanish lessons, and then there's an intruder, presumably the owl broke into your house to get you to learn a language.

129

Now, Duolingo has entered the zeitgeist, and there's thousands of memes, there's SNL skits about it,

130

and it's because we've managed to get people to want to learn a language by using the same techniques

131

that mobile games and social media use to get people engaged.

132

And this is a really important point, let me say this.

133

I don't actually believe

134

that there's a way to make an educational app be as engaging as something like TikTok or Instagram or mobile games.

135

But the good news is that, and by the way, the reason I don't believe that is because ultimately you have to teach people something, and it's hard to compete with cats and celebrities.

136

But the good news is that I don't think you have to.

137

See, here's the thing.

138

When you're learning something, you get meaning out of it.

139

Whereas when you're scrolling for two hours on Instagram, a lot of times, afterwards, you feel like you just wasted your time.

140

So I think it's actually OK if your educational product is only 80 or 90 percent as engaging as something like TikTok,

141

because the other 10 or 20 percent will be provided by people's internal motivation, though, of course, not much more than that.

142

This is really a key point.

143

If you want to get people to do something meaningful, you can use the same techniques that apps like social media use to get people to do it.

144

And even if you're not as engaging as those apps are, you can still get hundreds of millions of people to use your product.

145

In the case of Duolingo, for example, there are more people learning languages on Duolingo in the United

146

States than there are people learning languages across all U.S high schools combined.

147

And this is true in most countries in the world.

148

My hope is that, I know we can do this, but my hope is that as humanity, we can do what Duolingo has done for learning languages, but for all other subjects,

149

where we can get people to learn math with mobile phones, like millions of people to learn math with mobile phones, or physics, or whatever.

150

I hope for a future in which screen time is not a bad thing, in which we can deliver high-quality education to everyone, rich or poor, using a mobile phone.

151

But the single most important thing that I can end this talk with is a reminder to please, pretty please, I beg you, do your language lessons today.

152

Thank you very much.

153

Louise, thank you so much.

154

I wonder if you can just say a little bit more about that last point, about how do you think that you can apply this type of thinking to other subjects?

155

So you mentioned math, you mentioned things like that.

156

How do you do that?

157

In particular, subjects that are learned through repetition.

158

And it turns out most things that are really meaningful are learned through thousands and thousands of repetitions.

159

You learn to read through repetition, you learn elementary school math through repetition.

160

Most things that you can learn through repetition, you can actually gamify and turn into something like Duolingo, where people just do it a lot and do it fun.

161

It's a little harder for things like explanations.

162

That probably is going to require some really good videos.

163

Sal Khan is doing a really good job with that.

164

But for things that require a lot of repetition, I think we can use the same methods.

165

Amazing.

166

Thank you so much for sharing your life.

167

Thank you.

TRENDING

Populaires

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

☕ Offrez-nous un café

ShadowingEnglish reste 100% gratuit grâce à votre soutien. Les coûts des serveurs et de l'IA sont élevés — votre café nous aide à continuer ! 🙏

Faire un don via PayPal

ShadowingEnglish.com – Pratique du Shadowing en Anglais

Parlez anglais couramment grâce au Shadowing. Écoutez des vidéos YouTube de locuteurs natifs, répétez phrase par phrase et développez une vraie prononciation et fluidité — utilisé par les candidats IELTS du monde entier.

Pratique du Shadowing: How to Make Learning as Addictive as Social Media | Duolingo's Luis Von Ahn | TED - Apprendre l'anglais à l'oral avec YouTube

Populaires

About This Lesson

Key Vocabulary & Phrases

Practice Tips

Qu'est-ce que la technique du Shadowing ?

Pratique du Shadowing: How to Make Learning as Addictive as Social Media | Duolingo's Luis Von Ahn | TED - Apprendre l'anglais à l'oral avec YouTube

Télécharger l'application

About This Lesson

Key Vocabulary & Phrases

Practice Tips

Qu'est-ce que la technique du Shadowing ?