# Topic:numbers

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## Math in Motion: Playing with a desktop Galton Board

This delightful little device brings to life the statistical concept of normal distribution. As you rotate the Galton Board on its axis, you set into motion a flow of steel beads that bounce with equal probability to ...

## The Four-Legged Zoo: Multiplication by 4 with Schoolhouse Rock

The Four-Legged Zoo" is one in a series of Multiplication Rock episodes by Schoolhouse Rock! that were written and sung by Bob Dorough. Via wikipedia, the animated shorts "were created after ad agency co-chairman Davi...

## The infinite life of pi

The ratio of a circle's circumference to its diameter is always the same: 3.14159... and on and on (literally!) forever. This irrational number, pi, has an infinite number of digits, so we'll never figure out its exac...

## Emmanuelle Moureaux’s gridded rainbow installations

Tokyo-based French architect and artist Emmanuelle Moureaux visualized a decade of 'the future'—2017 to 2026—as a numerical rainbow forest in an installation for The National Art Center in Tokyo. The 2017 commission, ...

## Universal Calendar Puzzle: Figure out the day of the week for any date ever

Learn how to calculate the day of the week for any date you can think of with this impressive mental trick and some practice. In this It's Okay to Be Smart video, Universal Calendar Puzzle, Joe Hanson demonstrates the...

## How to multiply numbers by drawing lines

Learn how drawing lines and counting can visually calculate multi-digit multiplication problems. This handy math trick, sometimes referred to as the Japanese Multiplication Trick, lets little kids, visual learners, an...

## How many ways are there to prove the Pythagorean theorem?

What do Euclid, 12-year-old Einstein, and American President James Garfield have in common? They all came up with elegant proofs for the famous Pythagorean theorem, one of the most fundamental rules of geometry and th...

## How to spot a misleading graph

When they’re used well, graphs can help us intuitively grasp complex data. But as visual software has enabled more usage of graphs throughout all media, it has also made them easier to use in a careless or dishonest w...

## People In Order (2006)

How can you arrange a collection of short interactions with strangers in order to reveal something meaningful about life? In 2006, the UK’s Channel 4 commissioned a series of short films from filmmakers Lenka Clayton ...

## Calculating Pi (π) with Darts

Can you calculate Pi (π) by throwing darts at a square and circle target as randomly as possible? Physics Girl's Dianna Cowern and Veritasium's Derek Muller attempt the challenge, and when "randomly" doesn't happen, t...

## How high can you count on your fingers?

How high can you count on your fingers? It seems like a question with an obvious answer. After all, most of us have ten fingers -- or to be more precise, eight fingers and two thumbs. This gives us a total of ten digi...

## Can you solve the airplane riddle?

Professor Fukanō, the famous scientist, has embarked on a new challenge – piloting around the world in a plane of his own design. There’s just one problem: there's not enough fuel to complete the journey. Luckily, the...

## The stories behind Fahrenheit and Celsius

Fahrenheit (°F) is a unit of measurement for temperature. Daniel Gabriel Fahrenheit (1686–1736) is the inventor of the mercury-in-glass thermometer and the aforementioned scale of measurement. In this Veritasium video...

## How zip codes helped organize America

The 'zip' in zip code stands for The Zone Improvement Plan, an address code system that was invented in 1963 to help the United States Postal Service (USPS) deliver the increasing amount of mail being sent around the ...

## How a mathematician dissects an astonishing coincidence

True story about an adventure that befell Anne Parrish one June day in Paris. She was wandering through the old book stalls along the Seine with her husband who had been there before. He sat down at a table on the qua...

## The Remarkable Way We Eat Pizza – Numberphile

You may never look at a pizza or an orange in the same way again. Watch as astronomer, author, and teacher Cliff Stoll explains the Theorema Egregium or the Remarkable Theorem in this Numberphile vid. More via Aatish ...

## The Story of Zero – Getting Something from Nothing

Once upon a time, zero wasn’t really a number. Its journey to the fully fledged number we know and love today was a meandering one. Today, zero is both a placeholder, and tool, within our number system signifying an a...

## Can you solve the locker riddle? – TED Ed

File under factors, multiples, square numbers, prime numbers, and sequences: This classic mystery novel set up has a wonderful math puzzle twist: Your rich, eccentric uncle just passed away, and you and your 99 na...

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