Should you be worried about acid rain? – Joseph Goffman

Discover what causes acid rain, and how scientists were able to largely eliminate this major environmental threat. — In 1963, scientists studying Hubbard Brook Experimental Forest made a shocking discovery.…

This tool will help improve your critical thinking – Erick Wilberding

Explore the technique known as the Socratic Method, which uses questions to examine a person’s values, principles, and beliefs. — Socrates, one of the founding fathers of Western philosophical thought,…

The surprising secrets of hummingbird flight – Kristiina J. Hurme and Alejandro Rico-Guevara

Dig into the incredible fighting, feeding, and flying capabilities of hummingbirds. — In just a matter of seconds, hummingbirds can perform astonishing aerial acrobatics, eat lunch in midair, pollinate a…

Why good ideas get trapped in the valley of death— and how to rescue them

Explore why zero-carbon technologies are vulnerable to the valley of death in product development and how we can change it. — All new products must pass through the “valley of…

Can you outsmart the apples and oranges fallacy? – Elizabeth Cox

Dig into the false analogy fallacy, which assumes that because two things share a characteristic, they must be alike in other respects. — It’s 1997. The United States Senate has…

How does ultrasound work? – Jacques S. Abramowicz

Discover how scientists and doctors used bats’ ultrasound capabilities as inspiration for SONAR and non-invasive medical procedures. — In a dark cave, bats can’t see much. But even with their…

A brief history of the devil – Brian A. Pavlac

Download a free audiobook version of “Devil in the White City” and support TED-Ed’s nonprofit mission: https://www.audible.com/ted-ed — Satan, the beast crunching sinners’ bones. Lucifer, the fallen angel. Mephistopheles, the…

Why every world map is wrong – Kayla Wolf

Dig into the inaccuracies of flat maps and how different map designs can shift our point of view. — Fourteen Greenlands could fit in Africa— but you wouldn’t guess it…

Can you solve the fantasy election riddle? – Dennis E. Shasha

Practice more problem-solving at https://brilliant.org/TedEd/​ — After much debate, the realm has decided dragon jousting may not be the best way to choose its leaders, and has begun transitioning to…

Ugly History: The Spanish Inquisition – Kayla Wolf

Dig into the era of the Spanish Inquisition, when the Catholic Church was charged with rooting out and punishing heresy. — In 1478, Pope Sixtus IV issued a decree authorizing…

Ugly History: The Spanish Inquisition – Kayla Wolf

Dig into the era of the Spanish Inquisition, when the Catholic Church was charged with rooting out and punishing heresy. — In 1478, Pope Sixtus IV issued a decree authorizing…

What’s the best fuel for your car?

Dig into which fuel— gasoline, electric, biofuels, or electrofuels— is both affordable for consumers and sustainable for the planet. — Historically, most cars have run on gasoline, but that doesn’t…

A brief history of antidepressants – Neil R. Jeyasingam

Dig into the discovery of antidepressant drugs, how they work, and what we still don’t know about depression. — In the 1950s, the discovery of two new drugs sparked what…

How much land does it take to power the world?

Explore the sustainability of fossil fuels, nuclear power, and renewable energy and how much space each of these power sources use. — No matter how we make electricity, it takes…

The secret signals elephants use to communicate – Chase LaDue and Bruce A. Schulte

Discover the incredible ways elephants use their trunks to sense and communicate information and emotion. — As a breeze blows through the savannah, a snake-shaped tube stretches into the air…