### The Inverse Leidenfrost Effect

MathDroplets levitate on a bath of liquid nitrogen and are spontaneously self-propelled.

### Mushroom Cloud Myth | Because Science Footnotes

MathKyle debunks the Fallout Vault Boy myth, responds to your comments, and more!

### Can you solve the Leonardo da Vinci riddle?

MathYou've found Leonardo da Vinci's secret vault, secured by a series of combination locks. Fortunately, your treasure map has three codes: 1210, 3211000, and... hmm.

### Can Math Explain How Animals Get Their Patterns?

MathHow Alan Turing's Reaction-Diffusion Model Simulates Patterns in Nature.

### The Potato Paradox

MathThe potato paradox is a mathematical calculation that has a counter-intuitive result.

### What Is A Paradox?

MathA paradox is a statement that, despite apparently sound reasoning from true premises, leads to an apparently self-contradictory or logically unacceptable conclusion.

### Why can't you divide by zero? - TED-Ed

MathIn the world of math, many strange results are possible when we change the rules. But there's one rule that most of us have been warned not to break: don't divide by zero.

### Gyroscopic Precession

MathWe have been collaborating on rotational motion, which is timely for some of the videos I've been doing lately.

### String Theory Explained - What is The True Nature of Reality?

MathThis video was funded by SNSF under Agora Grant n. 171622 and through the NCCR SwissMAP: The Mathematics of Physics.

### The coin flip conundrum - Po-Shen Loh

MathWhen you flip a coin to make a decision, there's an equal chance of getting heads and tails.

### Can you solve the dark coin riddle? - Lisa Winer

MathYou heard the travelers' tales, you followed the maps, and now, you've finally located the dungeon containing a stash of ancient coins. The good news: the wizard who owns the castle has generously agreed to let you have the coins. The bad news: he's not quite as generous about letting you leave the dungeon ... unless you solve his puzzle. Can you solve it and get out alive? Lisa Winer shows how.

### How to Figure Out the Day of the Week For Any Day Ever

MathYou might think that computers are the only things that run algorithms, but you're wrong. Here's a neat mental trick for calculating the day of the week for any day ever, developed by famous mathematician John H. Conway

### The Napkin Ring Problem

MathDo you ever come across a math problem that you know is right but no matter how hard you try, you can't wrap your mind around it?

### A brief history of banned numbers - Alessandra King

MathThey say the pen is mightier than the sword, and authorities have often agreed. From outlawed religious tracts and revolutionary manifestos to censored and burned books, we know the potential power of words to overturn the social order. But as strange as it may seem, some numbers have also been considered dangerous enough to ban. Alessandra King details the history behind illegal numbers.

### Can you find the next number in this sequence? - Alex Gendler

Math1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? Alex Gendler reveals the answer and explains how beyond just being a neat puzzle, this type of sequence has practical applications as well.

### Why underdogs do better in hockey than basketball

MathA statistical analysis of luck vs skill in sports.

### Check your intuition: The birthday problem - David Knuffke

MathImagine a group of people. How big do you think the group would have to be before there's more than a 50% chance that two people in the group have the same birthday? The answer is ... probably lower than you think. David Knuffke explains how the birthday problem exposes our often-poor intuition when it comes to probability.

### Can you solve the pirate riddle? - Alex Gendler

MathIt's a good day to be a pirate. Amaro and his four mateys - Bart, Charlotte, Daniel, and Eliza have struck gold - a chest with 100 coins. But now, they must divvy up the booty according to the pirate code - and pirate code is notoriously complicated. Can you help come up with the distribution that Amaro should propose to make sure he lives to tell the tale? Alex Gendler shows how.

### Can you solve the three gods riddle? - Alex Gendler

MathYou and your team have crash-landed on an ancient planet. Can you appease the three alien overlords who rule it and get your team safely home? Created by logician Raymond Smullyan, and popularized by his colleague George Boolos, this riddle has been called the hardest logic puzzle ever. Alex Gendler shows how to solve it.

### Can you solve the virus riddle? - Lisa Winer

MathYour research team has found a prehistoric virus preserved in the permafrost and isolated it for study. After a late night working, you're just closing up the lab when a sudden earthquake hits and breaks all the sample vials. Will you be able to destroy the virus before the vents open and unleash a deadly airborne plague? Lisa Winer shows how.