# Topic: *math*

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

Your expedition finally stands at the heart of the ancient temple. But as you study the inscriptions in the darkness, two wisps of green smoke burst forth. The walls begin to shake. The giant sandglass begins flowing ...

## The iPhone of Slide Rules – Numberphile

From Numberphile, science and math writer Alex Bellos introduces the slide rule and then shares "the iPhone of Slide Rules" -- the Halden Calculex. On the pocket-sized disk made in Manchester, circa 1906, CollectingMe...

## Circular motion demonstration with a sparkler & a hula hoop

From physics teacher and film maker Alom Shaha, check out these simple demonstrations showing how something moving in a circle will move in a straight line when you remove the centripetal force acting upon that thing....

## Plastic Injection Molding

Bill [Hammack] details the key engineering principles underlying plastic injection molding. He describes its history and then reveals the intricate details of the process. He shows viewers where to found, on any injec...

## Mathematical Present Wrapping with Katie Steckles

When you're wrapping a variety of shapes, it can be a challenge to wrap them neatly, but with a bit of measuring, thoughtful folding, and practice, your cuboid, pentahedron or equilateral triangular prism, cylinder, o...

## Notes on a Triangle (1966) by René Jodoin

From the National Film Board of Canada and director René Jodoin, this is Notes on a Triangle (1966), a ballet of three hundred geometric transformations, animated into divisions, alignments, and patterns. Waltz music ...

## Odd – Mysteries of Vernacular

Odd. Odd. Say it a few times, and the word 'odd' sounds odd. Peculiar. Different from what is usual or expected. Of course, we also know that odd numbers can't be divided evenly into two groups. But where did this odd...

## Emperor Penguins keep warm in an ever-shifting huddle

With brand new baby chicks sheltering in so many of their brood pouches, warmth is imperative for Emperor Penguins in the coldest place on the planet. But how do you stay warm enough to survive in -40 degrees or colde...

## General relativity & why GPS wouldn’t work if we didn’t know about it

General relativity, what Albert Einstein said was the happiest thought of his life, basically expands upon the idea that "the laws of physics are the same everywhere". Light and gravity behave in the same way for you....

## Debunking the “I will never need to use this…” myth

If you've ever heard the phrase, "I will never need to use this ever again," regarding a theorem of mathematics, or a scientific law, or a fact from the history of a far corner of the planet, consider this from astrop...

## The Pythagorean theorem water demo

The Pythagorean theorem water demo: See the two smaller squares of water on the two shorter sides of a right triangle pour perfectly and equally into the area of the larger square on the longer side, known as the hypo...

## From Clay to Mosaics – How zellige (الزليج) mosaics are made

From Moroccan interior design company Habibi Interiors, watch as maâlems (master craftsmen) take their time and skill to create terra cotta tiles known as zellige, zillij, or الزليج, meaning "tiles" in Arabic: From Cl...

## Fold & Cut Theorem – Cut any shape from only one cut

Can you cut a square from the center of a piece of paper with just one straight cut? Spoiler: YES, you can. In this Numberphile video, Manchester-based mathematician Dr. Katie Steckles demonstrates an idea that dates ...

## The mathematical secrets of Pascal’s triangle – TED Ed

It's known as Pascal's triangle in the Western world, but centuries before that, it was the Staircase of Mount Meru in India, the Khayyam Triangle in Iran, and Yang Hui's Triangle in China. It can look complicated at ...

## How many LEGO combinations can be made with 6 standard bricks?

"How many ways can you put together six of these bricks?" This question, asked and answered in 1958 with an estimate of 103 million, has only recently been answered correctly, thanks to math professor Soren Eilers and...

## Sunlight is way older than you think – TED Ed

The random walk problem -- the "mathematical formalization of a path that consists of a succession of random steps" -- can be applied to sunlight... not the sunlight that travels from the sun to Earth, which takes onl...