Recreational mathematics

• Recreational mathematics

• Vi Hart
• Brain teasers

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Vi Hart

 

 

 

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Spirals, Fibonacci and being a plant

You're feeling spirally today, and math class today is taking place in greenhouse #3...

• Doodling in Math: Spirals, Fibonacci, and Being a Plant [1 of 3]
• Doodling in Math: Spirals, Fibonacci, and Being a Plant [2 of 3]
• Doodling in Math: Spirals, Fibonacci, and Being a Plant [Part 3 of 3]
• Open Letter to Nickelodeon, Re: SpongeBob's Pineapple under the Sea
• Angle-a-trons

Doodling in Math

Let's say you're me and you're in math class…

• Doodling in Math: Infinity Elephants
• Doodling in Math: Stars
• Doodling in Math: Binary Trees
• Doodling in Math: Sick Number Games
• Doodling in Math: Squiggle Inception
• Doodling in Math: Connecting Dots
• Doodling in Math: Triangle Party
• Doodling in Math: Snakes + Graphs

Hexaflexagons

Since it's shaped like a hexagon and flex rhymes with hex, hexaflexagon it is!

• Hexaflexagons
• Hexaflexagons 2
• Hexaflexagon Safety Guide
• Flex Mex

About pi and tau

When you want to make a circle, how is it done? Well you probably will start with the radius one.

• A Song About A Circle Constant
• Pi Is (still) Wrong.
• Rhapsody on the Proof of Pi = 4
• Are Shakespeare's Plays Encoded within Pi?

Singing (and noises)

The title says it all...

• Doodle Music
• Binary Hand Dance
• What is up with Noises? (The Science and Mathematics of Sound, Frequency, and Pitch)
• Folding Space-Time

Mobius strips

Playing mathematically with strips!

• Math Improv: Fruit by the Foot
• Mobius Story: Wind and Mr. Ug

Thanksgiving math

Mathed potatoes, Borromean onion rings, green bean matheroles and Turduckenen-duckenen (yes, you read that right)

• Green Bean Matherole
• Borromean Onion Rings
• Optimal Potatoes
• Thanksgiving Turduckenen-duckenen

Other cool stuff

Pythagoras, snakes, fractals, snowflakes...

• What was up with Pythagoras?
• Origami Proof of the Pythagorean Theorem
• 9.999... reasons that .999... = 1
• Wau: The Most Amazing, Ancient, and Singular Number
• Dialogue for 2
• Fractal Fractions
• How To Snakes
• Re: Visual Multiplication and 48/2(9+3)
• The Gauss Christmath Special
• Snowflakes, Starflakes, and Swirlflakes
• Sphereflakes
• Reel

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Brain teasers

 

 

 

 

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

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1. Liar Truth-teller Brain Teaser
2. Toggler Brain Teaser
3. Alien Abduction Brain Teaser
4. Blue Forehead Room Brain Teaser
5. Blue Forehead Room Solution

1. Forehead Numbers Brain Teaser
2. Light Bulb Switching Brain Teaser
3. Path Counting Brain Teaser
4. 3-D Path Counting Brain Teaser