By 2050, it's estimated that over 65% of the world will be living in cities. We may think of nature as being unconnected to our urban spaces, but trees have always been an essential part of successful cities. Humanity has been uncovering these arboreal benefits since the creation of our first cities thousands of years ago. So what makes trees so important to a city's survival? Stefan Al explains. [Directed by Mette Ilene Holmriis, narrated by Addison Anderson, music by Bamm Bamm Wolfgang].

What happens if you cut down all of a city's trees? | Stefan Al

TED-Ed's commitment to creating lessons worth sharing is an extension of TED's mission of spreading great ideas. Within TED-Ed's growing library of TED-Ed animations, you will find carefully curated educational videos, many of which represent collaborations between talented educators and animators nominated through the TED-Ed website (ed.ted.com).

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You're a biologist on a mission to keep the rare honeybee Apis Trifecta from going extinct. The last 60 bees of the species are in your terrarium. You've already constructed wire frames of the appropriate size and shape. Now you need to turn them into working beehives by filling every hex with wax. Can you help the bees create producing hives? Dan Finkel shows how. [Directed by Charlotte Arene, narrated by Addison Anderson, music by Stephen LaRosa].

Can you solve the honeybee riddle? | Dan Finkel

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 Christine Ladwig explore the different strategies of this ethical dilemma. [Directed by Patrick Smith, narrated by Addison Anderson, music by Cem Misirlioglu / WORKPLAYWORK].

Ethical dilemma: The burger murders | George Siedel and Christine Ladwig

From Ancient Greece to the 20th century, Aristotle, Freud, and numerous other scholars were all looking for the same thing: eel testicles. Freshwater eels could be found in rivers across Europe, but no one had ever seen them mate and no researcher could find eel eggs or identify their reproductive organs. So how do eels reproduce, and where do they do it? Lucy Cooke digs into the ancient mystery. [Directed by Anton Bogaty, narrated by Adrian Dannatt, music by Jarrett Farkas].

No one can figure out how eels have sex | Lucy Cooke

The average 20-year-old knows between 27,000 and 52,000 different words. Spoken out loud, most of these words last less than a second. With every word, the brain has a quick decision to make: which of those thousands of options matches the signal? And about 98% of the time, the brain chooses the correct word. How is this possible? Gareth Gaskell digs into the complexities of speech comprehension. [Directed by Art Shot, narrated by Addison Anderson, music by Stephen LaRosa].

What happens if you cut down all of a city's trees? | Stefan Al

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