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# Topic: *math*

## The Sphere-Packing Problem

The next time you're eating candy, ask yourself: "What's the best way to stack this?" Then start arranging them to find out. The answer to this question can be found in the shape of the candy. In this University of...

## The Multiplying Rabbits Riddle

After years of experiments, you’ve finally created the pets of the future – nano-rabbits! They’re tiny, they’re fuzzy ... and they multiply faster than the eye can see. But a rival lab has sabotaged you, threatening t...

## Hypocycloid circular motion optical illusion

A circle made of points, shown here with small white balls, appears to roll around the inside edge of a larger circle, but is that what's really happening? File under: Cycloids, hypocycloids, and optical illusions. Th...

## Can you solve the time travel riddle?

Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colo...

## Mysteries of the world’s biggest dome

How did Filippo Brunelleschi use engineering, design, math, and secrecy to build the world's biggest dome? "...Experts still don't fully understand the brilliant methods he used in constructing the dome, which tops th...

## An accidental toy inventor’s shapeshifting designs

What if we could make objects transform in the same way a flower unfolds from its bud? This is what designer, Harvard professor, and accidental toy inventor Chuck Hoberman is trying to figure out. His work, ranging fr...

## Can you solve the stolen rubies riddle?

Townspeople are demanding that a corrupt merchant’s collection of 30 rubies be confiscated to reimburse the victims of his schemes. The king announces that the fine will be determined through a game of wits between th...

## The Universal Pattern Popping Up in Math, Physics, & Biology

Scientists have discovered a mysterious universal pattern that "connects a bus system in Mexico and chicken eyes to quantum physics and number theory." MentalFloss summarizes the formerly hidden phenomenon, known as u...

## The ‘magic’ of invisibility lenses

Using lenses to bend light, YouTuber Brusspup makes a ruler, a knife, a spoon, a hand, and a laser completely disappear from view. Invisibility lenses create the illusion, an optical trick based on The Rochester Cloak...

## Can you solve the Leonardo da Vinci riddle?

You’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. The last one appears to be missing. Can you figure out ...

## Types of Triangles, a Flocabulary math music video

This triangle is acute. Right triangle, obtuse. Isosceles, scalene. Equilateral, now you know the whole team. Learn the basics of triangles with Types of Triangles, a catchy and informative math music video from th...

## Can you solve the rogue AI riddle?

You're on a special mission to save the world from a hostile artificial intelligence called NIM. It's taken over computers all over the globe and you only have one opportunity to shut it down. NIM will also be working...

## Anastasia Chavez explains the 21-card trick

How can you use math to astonish your friends and family? Try the 21-card trick. Filmed for Numberphile, UC Davis Department of Mathematics Postdoc Anastasia Chavez demonstrates step-by-step how this trick works with ...

## Can you solve the Mondrian squares riddle?

Dutch artist Piet Mondrian’s abstract, rectangular paintings inspired mathematicians to create a two-fold challenge. Can you solve the puzzle and get to the lowest score possible? Board game and puzzle designer and...

## The Art Of Making Noodles By Hand: Peter Song and Shuichi Kotani

Throwing, twisting, stretching, pulling, multiplying. In the first half of this Tasty video, Kung Fu Kitchen's noodle master Peter Song demonstrates how he handmakes his restaurants' famous noodles: Hand-making pr...

## Observing the angle of repose with DIY physics devices

The angle of repose or critical angle of repose is how steep various types of materials can be piled without slumping. The steepness of the side of a pile is determined by the amount of friction between the particles ...

## Can you solve the penniless pilgrim riddle?

After months of travel, you’ve arrived at Duonia, home to the famous temple that’s the destination of your pilgrimage. The walk from the welcome center to the temple isn't a long one ... but there’s a problem. Can you...