Articles I-III of the United States Constitution allow for three separate branches of government (legislative, executive, and judicial), along with a system of checks and balances should any branch get too powerful. Belinda Stutzman breaks down each branch and its constitutionally-entitled powers. [Directed by Johnny Chew, narrated by Belinda St...

How likely is it that a massive asteroid will do major damage to Earth and its inhabitants? What about the sun -- is it dying out anytime soon? And the supermassive black hole at the center of the Milky Way -- should we be worried about that? Ron Shaneyfelt assesses the dangers of space. [Directed by Retchy, narrated by Ron Shaneyfelt].

In the past decade, the US honeybee population has been decreasing at an alarming and unprecedented rate. While this is obviously bad news for honeypots everywhere, bees also help feed us in a bigger way -- by pollinating our nation's crops. Emma Bryce investigates potential causes for this widespread colony collapse disorder. [Directed by Lilli...

In 1996, a British Airways plane flew from New York to London in a record-breaking two hours and fifty-three minutes. Today, however, passengers flying the same route can expect to spend no less than six hours in the air — twice as long. So why, in a world where everything seems to be getting faster, have commercial flights lagged behind? Alex G...

All around the world, millions of people are flipping a switch, plugging in, and pressing an 'on' button every second. So how much electricity does humanity use? And how much will we need in the future? Discover how much energy it takes to power the world, and how clean energy sources could help revolutionize our electricity supply. [Written by ...

Inside our cells, each of us has a second set of genes completely separate from our 23 pairs of chromosomes. And this isn't just true for humans— it's true of every animal, plant, and fungus on Earth. This second genome belongs to our mitochondria, an organelle inside our cells. So why are they so different from anything else in our bodies? Devi...

Once every century, the world's greatest spiders gather to compete in a series of grueling games. The winner will become the next arachnomonarch, able to command all the world's spiders to their will. That day is today, and for the first time, you're casting your name into the ring. Can you attain the mantle of spider supremacy? Dan Finkel shows...

In January 1953, a tidal surge shook the North Sea. The titanic waves flooded the Dutch coastline, killing almost 2,000 people. 54 years later, a similar storm threatened the region. But this time, they were ready. This was thanks to a massive, interlocking system known as the Delta Works— the most sophisticated flood prevention project in the w...

Despite water covering 71% of the planet's surface, more than half the world's population endures extreme water scarcity for at least one month a year. Current estimates predict that by 2040, up to 20 more countries could be experiencing water shortages. These statistics raise a startling question: is the Earth running out of clean water? Balshe...

Particles come in pairs which is why there should be an equal amount of matter and antimatter in the universe. Yet scientists have not been able to detect any in the visible universe. Where is this missing antimatter? CERN scientist Rolf Landua returns to the seconds after the Big Bang to explain the disparity that allows humans to exist today. ...

Ah, spring. Grass growing, flowers blooming, trees budding. For those with allergies, though, this explosion of new life probably inspires more dread than joy. So what's behind this annual onslaught of mucus? Eleanor Nelsen explains what happens when your immune system goes rogue. [Directed by Lisa LaBracio, narrated by Addison Anderson, music b...

Human bodies aren't built for extreme aging: our capacity is set at about 90 years. But what does aging really mean, and how does it counteract the body's efforts to stay alive? Monica Menesini details the nine physiological traits that play a central role in aging. [Directed by Cinematic, narrated by Pen-Pen Chen].

Professor Fukanō, the famous scientist, has embarked on a new challenge – piloting around the world in a plane of his own design. There's just one problem: there's not enough fuel to complete the journey. Luckily, there are two other planes to help. Can you help the professor fly for the whole trip and achieve his dream, without anyone running o...

In 1981, the US economy was struggling: unemployment rates were climbing and inflation had peaked at an all-time high. To combat these issues, President Reagan introduced a number of economic policies, including tax cuts for large corporations and high-income earners. But did these policies actually stimulate economic growth or improve circumsta...

Animal behavior isn't complicated, but it is complex. Nicolas Perony studies how individual animals -- be they Scottish Terriers, bats or meerkats -- follow simple rules that, collectively, create larger patterns of behavior. And how this complexity born of simplicity can help them adapt to new circumstances, as they arise.

In 132 CE, Zhang Heng presented his latest invention: a large vase he claimed could tell them whenever an earthquake occurred for hundreds of miles. Today, we no longer rely on pots as warning systems, but earthquakes still offer challenges to those trying to track them. Why are earthquakes so hard to anticipate, and how could we get better at p...

While searching for a kidney donor, Karen Keegan stumbled upon a mystery. After undergoing genetic testing, it turned out that some of her cells had a completely different set of genes from the others. And this second set of genes belonged to her twin sister— who had never been born. How did this happen? Kayla Mandel Sheets explores the conditio...

You're the realm's greatest mathematician, but ever since you criticized the Emperor's tax laws, you've been locked in the dungeon. Luckily for you, one of the Emperor's governors has been convicted of paying his taxes with a counterfeit coin, which has made its way into the treasury. Can you earn your freedom by finding the fake? Jennifer Lu sh...

It was a normal Tuesday at the superconductor, until a bug in the system caused your team to be trapped in 11 separate dimensions. Fortunately, there's a half-finished experimental teleportation robot that may be able to get you all home... if you can figure out how to work it. Can you work out the robot's design quirks and get your team back ho...

As the threat of COVID-19 continues, infectious disease expert and TED Fellow Adam Kucharski answers five key questions about the novel coronavirus, providing necessary perspective on its transmission, how governments have responded and what might need to change about our social behavior to end the pandemic. (This video is excerpted from a 70-mi...

GPS location apps on a smartphone can be very handy when mapping a travel route or finding nearby events. But how does your smartphone know where you are? Wilton L. Virgo explains how the answer lies 12,000 miles over your head, in an orbiting satellite that keeps time to the beat of an atomic clock powered by quantum mechanics. [Directed by Nic...

One bag of apples, one apple, one slice of apple-- which of these is one unit? Explore the basic unit of math (explained by a trip to the grocery store!) and discover the many meanings of one. [Directed by Biljana Labovic, narrated by Christopher Danielson].

Imagine you were asked to invent something new. It could be whatever you want, made from anything you choose, in any shape or size. That kind of creative freedom sounds so liberating, doesn't it? Or ... does it? if you're like most people you'd probably be paralyzed by this task. Why? Brandon Rodriguez explains how creative constraints actually ...

Once a year, thousands of logicians descend into the desert for Learning Man. At the center of that gathering is the world's most exclusive club, where under the full moon the annual logician's rave takes place. The entry is guarded by the Demon of Reason, and the only way in is to solve one of his dastardly challenges. Can you get into the rave...

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 ...

No matter your industry, you've experienced drama at work. In this funny and all-too-relatable talk, community leader Anastasia Penright outlines five steps you can follow to better coexist with your coworkers and focus on what's really important.

Filmmaker Newton Aduaka shows clips from his powerful, lyrical feature film "Ezra," about a child soldier in Sierra Leone.

According to legend, three galactic terraformers shaped your planet into a paradise. When their work was done, they left the source of their power behind: three golden hexagons, hidden in dungeons full of traps and monsters. If one person were to bring all three together, they could reinvent the world however they saw fit. Can you collect the he...

You founded a company that manufactures meatless burgers that are sold in stores worldwide. But you've recently received awful news: three people in one city died after eating your burgers. A criminal has injected poison into your product! The deaths are headline news and sales have plummeted. How do you deal with the crisis? George Siedel and C...

Ragnarok: The fabled end of the world, when giants, monsters, and Norse gods battle for the future. The gods were winning until the great serpent Jörmungandr emerged. It swallowed Valhalla and contorted itself across the land. Odin has just enough power to strike with one final bolt of lightning, and you have the fabled hammer, Mjölnir. Can you ...