Check out our Patreon page:

View full lesson:

Want more? Try to solve the buried treasure riddle:

The Infinite Hotel, a thought experiment created by German mathematician David Hilbert, is a hotel with an infinite number of rooms. Easy to comprehend, right? Wrong. What if it's completely booked but one person wants to check in? What about 40? Or an infinitely full bus of people? Jeff Dekofsky solves these heady lodging issues using Hilbert's paradox.

Lesson by Jeff Dekofsky, animation by The Moving Company Animation Studio.

Making sense of irrational numbers - Ganesh Pai

View full lesson: Like many heroes of Greek myths, the philosopher Hippasus w...

Can you solve the rogue AI riddle? - Dan Finkel

Practice more problem-solving at Sign up to be emailed the solution to the bonus riddle:

Exploring other dimensions - Alex Rosenthal and George Zaidan

View full lesson: Imagine a two-dimensional world -- you, your ...

Where does gold come from? - David Lunney

View full lesson: Did you know that gold is extraterrestrial? Instead of arising fro...

What is Zeno's Dichotomy Paradox? - Colm Kelleher

View full lesson: Can you ever travel from one place to another? Ancient Gre...

Wormholes Explained – Breaking Spacetime

To support Kurzgesagt and learn more about Brilliant, go to and sign up for free. The first 688 people that go to t...