From the science behind stretching muscles and crooked teeth to the everyday mysteries of food expiration dates and airplane mode, these TED-Ed animations captured our attention in 2023.

Viruses are wildly successful organisms. There are about 100 million times as many virus particles on Earth as there are stars in the observable universe. Even so, viruses can and do go extinct. So, what is the possibility of the virus that causes COVID-19 going extinct? Explore the three main ways viruses can be driven to extinction. [Directed ...

Can we call any economy "healthy" in the face of dwindling resources and growing inequality? What if we cut off our addiction to endless growth, and used a new compass for modern prosperity? One such compass is known as "doughnut economics," which aims to meet the needs of people without overshooting Earth's ecological limits. Explore how this m...

What's the best country to live in? Is it the one with the best food? The longest life expectancy? The best weather? For the past 70 years, most governments have relied heavily on a single number: the Gross Domestic Product, or GDP. But it was never intended for its current purpose; and some argue that we are addicted to making it grow. Explore ...

As of 2020, the world's biggest lithium-ion battery is hooked up to the Southern California power grid and can provide enough power for about 250,000 homes. But it's actually not the biggest battery in the world: a pair of lakes are. How can lakes be a battery? Explore how inventors are rethinking what a battery can be, and how these surprising ...

For centuries, billiard balls were made of ivory from elephant tusks. But when excessive hunting caused elephant populations to decline, they began to look for alternatives. John Wesley Hyatt took up the challenge. In five years, he invented a new material called celluloid, which would become known as the first plastic. Trace the history of the ...

After a week of studying, you feel confident that you'll ace your exam. But when you get your grade back, it's much lower than you expected. You're devastated, and the disappointment is hard to shake. Should you be trying to look on the bright side? And is controlling your emotions even possible? Explore techniques to help you identify, understa...

Picture this: you're working a shift in a hotel lobby when someone approaches the front desk. They found a lost wallet around the corner, but they're in a rush and don't have time to follow up. Looking at the wallet you see it contains a key, grocery list, about $13, and three business cards you assume belong to the wallet's owner. So, what do y...

A 2016 survey of freelancers in six countries found that those who freelance by choice– 70% of respondents– were happier than people in traditional jobs, specifically when it came to things like independence and flexibility in terms of where and when they work. So what does it take to be a successful freelancer? Explore the benefits and drawback...

All new products must pass through the "valley of death" before they reach the market. Many never make it out, and sometimes that's OK -- if they don't work, don't fill a need or for any number of reasons. One of the fields where this problem is most pressing is zero-carbon technologies. Why is it vulnerable to this trap, and can we change it? E...

Many people deal with a nail-biting habit at some point in their lives. Some will go to great lengths to try to stop, employing strategies like dipping their hands in salt or wearing gloves. And while not all of us are nail-biters, most of us do have a habit we'd like to kick. So, what's the best way to break one? Explore how habits are formed, ...

Income and wealth inequality are not new. In fact, economists and historians who have charted economic inequality throughout history haven't found a single society without it. Which raises a bleak question: is inequality ... inevitable? Explore how economic inequality can be measured and how it is impacted by different governmental policy choice...

Many economists think that an eternally growing economy is necessary to keep improving people's lives, and that if the global economy stops growing, people would fight more over the fixed amount of value that exists, rather than working to generate new value. Which raises the question: is infinite growth possible on a finite planet? Explore how ...

The report you've been putting off is due tomorrow. It's time to buckle down, open your computer ... and check your phone. Maybe watch your favorite YouTube channel? Or maybe you should just start in the morning? This is the cycle of procrastination. So, why do we procrastinate when we know it's bad for us? Explore how your body triggers a procr...

Historically, most cars have run on gasoline, but that doesn't have to be the case in the future: other liquid fuels and electricity can also power cars. So what are the differences between these options? And which one's best? Dig into which fuel— gasoline, electric, biofuels, or electrofuels— is both affordable for consumers and sustainable for...

With the invention of the atomic bomb, humanity gained the power to destroy itself for the first time in our history. Since then, our risk of either extinction or the collapse of civilization has steadily increased. Just how likely are we to destroy ourselves? And what poses the greatest threat to our survival? Dig into four existential threats ...

People have become increasingly worried that the threats we face today, like climate change and rising inequality, can't be solved by a capitalist economic system. So, is that true? And if it is, can we fix capitalism or do we need to tear the system down and build a new one from scratch? Explore the different types of capitalism and the role it...

We tend to think of pandemics as unlikely events, but disease outbreaks are surprisingly common. Over the past 400 years, the longest stretch of time without a documented outbreak was just four years. So, what's the probability of experiencing another world-changing pandemic in your lifetime? Explore the likelihood of a future pandemic and the s...

Since 1850, global average temperatures have risen by 1 degree Celsius. That may not sound like a lot, but it is. Why? 1 degree is an average. Many places have already gotten much warmer and if average temperatures increase one more degree, the coldest nights in the Arctic might get 10 degrees warmer. So how did we get here? And what can be done...

Everything our bodies do— whether physical or mental— uses energy. Studies have found that many individuals seem to have a daily threshold for making decisions, and an extended period of decision-making can lead to cognitive exhaustion. So, what kinds of choices lead us to this state, and what can we do to fight fatigue? Explore the psychology o...

A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We're one of the select few mammals on Earth that menstruate, and we also do it more than any other animal, even though it's a waste of nutrients, and can be a physical inconvenience. So where's the sense in this uncommon biological process? TED-Ed describes the...

The year is 1656. Your body is wracked by violent chills. Your head pounds and you're too weak to sit up. In your feverish state, you see a strange-looking man wearing a beak-like mask, his body covered from head to toe. Without seeing his face, you know: you have the plague. So, where did these iconic outfits come from? Stephanie Honchell Smith...

Being caught talking to yourself can feel embarrassing, and some people even stigmatize this behavior as a sign of mental instability. But decades of research show that talking to yourself is completely normal; most if not all of us engage in some form of self-talk every day. So why do we talk to ourselves? And does what we say matter? Dig into ...

In the coming years, artificial intelligence is probably going to change your life— and likely the entire world. But people have a hard time agreeing on exactly how AI will affect our society. Can we build AI systems that help us fix the world? Or are we doomed to a robotic takeover? Explore the limitations of artificial intelligence and the pos...

A 2006 study took a class of surgical residents and split them into two groups. Each received the same study materials, but one group was told to use specific study methods. When tested a month later, this group performed significantly better than the other residents. So, what were these methods? Explore how the brain learns and stores informati...

In 1972, psychologists at the University of Colorado surveyed 140 couples to determine whether a relationship facing parental disapproval was more likely to strengthen or crumble under the pressure. Can long-term success of a romantic relationship be predicted by the perceived approval or disapproval of the couple's friends and family? Dig into ...

It's easy to tell when someone's not paying attention, but it can be surprisingly tricky to know what good listening looks like. Good listening is one of the most important things we can do to improve our relationships, develop our worldview, and potentially change people's minds. So what can we do to become better listeners? Dig into different ...

Is it possible that this century is the most important one in human history? The 21st century has already proven to be a period of rapid growth. We're on the cusp of developing new technologies that could entirely change the way people live— and could contribute to unprecedented levels of existential risk. Explore how the decisions we make now m...

No matter how we make electricity, it takes up space. Coal requires mines, and plants to convert it into electricity. Nuclear power takes uranium mines, facilities to refine it, a reactor, and a place to store the spent fuel safely. Renewable energy needs wind turbines or solar panels. So how much space would it take to power the whole world? Ex...

Co-ops are a big part of the global economy: they employ 10% of the world's workforce and over two trillion dollars flow through their doors every year. At a co-op, there's no single person with overarching, top-down power over everyone else, like a CEO at a traditional company. So what exactly is a co-op and how does it work? Explore the differ...