Browse Lessons

Plato's allegory of the ring - Alex Gendler

What is a gig economy?

Would you pass the wallet test?

Coneheads, egg stacks, and anteater attacks: The reign of a termite queen - Barbara L. Thorne

The Boltzmann brain paradox - Fabio Pacucci

The secret formula to Agatha Christie's murder mysteries - Jamie Bernthal

Why did Phillis Wheatley disappear? - Charita Gainey

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

The smallest solution to one of our biggest problems - Tierney Thys & 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

What do dumplings look like around the world? - 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: The Khmer Rouge murders - Timothy Williams

How does heart transplant surgery work? - Roni Shanoada

Why are eating disorders so hard to treat? - Anees Bahji

Ugly History: The El Mozote murders - Diana Sierra Becerra

Do tax cuts stimulate the economy? - Jonathan Smith

The biggest mistakes in mapmaking history - Kayla Wolf

The Irish myth of Diarmuid’s betrayal - Iseult Gillespie

How the Suez Canal changed the world - Lucia Carminati

The Chinese myth of the forbidden lovers - Shannon Zhao

Can you solve the private eye riddle? - Henri Picciotto

The dark history of zombies - Christopher M. Moreman

Why are cockroaches so hard to kill? - Ameya Gondhalekar

The myth of Hades and Persephone - Iseult Gillespie

Ethical dilemma: Who should you believe? - Alex Worsnip

Watch this if you're scared of snakes - Andrew Whitworth

History vs. Tamerlane the Conqueror - Stephanie Honchell Smith

Are the Northern Lights dangerous? - Fabio Pacucci

A riddle of ice and fire dragons - Henri Picciotto

The Chinese legend of the butterfly lovers - Lijun Zhang