TED-Ed

Can the economy grow forever?

The rise and fall of the medieval Islamic Empire - Petra Sijpesteijn & Birte Kristiansen

Can you guess what's wrong with these paintings? - Noah Charney

A brief history of Spanish - Ilan Stavans

Why a sausage can do what your gloves cannot - Charles Wallace and Sajan Saini

This weird trick will help you summon an army of worms - Kenny Coogan

The true cost of gold - Lyla Latif

The 4 greatest threats to the survival of humanity

What causes yeast infections, and how do you get rid of them? - Liesbeth Demuyser

Hagfish: The world's slimiest creatures - Noah R. Bressman and Douglas Fudge

Meet the microbes that could eat your trash - Tierney Thys and Christian Sardet

How does alcohol cause hangovers? - Judy Grisel

What’s the best country to live in?

What happens to your body at the top of Mount Everest - Andrew Lovering

Why can parrots talk? - Grace Smith-Vidaurre and Tim Wright

A brief history of dumplings - Miranda Brown

Artemisia Gentileschi: The woman behind the paintings - Allison Leigh

These animals are also plants … wait, what? - Luka Seamus Wright

What is the rarest color in nature? - Victoria Hwang

Can you outsmart the college admissions fallacy? - Elizabeth Cox

Ethical dilemma: Would you lie? - Sarah Stroud

Can you solve the fortress riddle? - Henri Picciotto

Ugly History: Cambodian Genocide - Timothy Williams

How does heart transplant surgery work? - Roni Shanoada