## 1. A performance of "Mathemagic" by Arthur Benjamin

In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. How does he do it? He'll tell you.

## 2. Why I fell in love with monster prime numbers by Adam Spencer

They're millions of digits long, and it takes an army of mathematicians and machines to hunt them down — what's not to love about monster primes? Adam Spencer, comedian and lifelong math geek, shares his passion for these odd numbers, and for the mysterious magic of math.

## 3. Math is forever by Eduardo Sáenz de Cabezón

With humor and charm, mathematician Eduardo Sáenz de Cabezón answers a question that's wracked the brains of bored students the world over: What is math for? He shows the beauty of math as the backbone of science — and shows that theorems, not diamonds, are forever.

## 4. Symmetry, reality's riddle by Marcus du Sautoy

The world turns on symmetry — from the spin of subatomic particles to the dizzying beauty of an arabesque. But there's more to it than meets the eye. Here, Oxford mathematician Marcus du Sautoy offers a glimpse of the invisible numbers that marry all symmetrical objects.

## 5. The math and magic of origami by Robert Lang

Robert Lang is a pioneer of the newest kind of origami — using math and engineering principles to fold mind-blowingly intricate designs that are beautiful and, sometimes, very useful.

## 6. The surprising math of cities and corporations by Geoffrey West

Physicist Geoffrey West has found that simple, mathematical laws govern the properties of cities — that wealth, crime rate, walking speed and many other aspects of a city can be deduced from a single number: the city's population. In this mind-bending talk from TEDGlobal he shows how it works and how similar laws hold for organisms and corporations.

## 7. The fractals at the heart of African designs by Ron Englash

'I am a mathematician, and I would like to stand on your roof.' That is how Ron Eglash greeted many African families he met while researching the fractal patterns he'd noticed in villages across the continent.

## 8. Fractals and the art of roughness by Benoit Mandelbrot

At TED2010, mathematics legend Benoit Mandelbrot develops a theme he first discussed at TED in 1984 — the extreme complexity of roughness, and the way that fractal math can find order within patterns that seem unknowably complicated.

## 9. The mathematics of history by Jean-Baptiste Michel

What can mathematics say about history? According to TED Fellow Jean-Baptiste Michel, quite a lot. From changes to language to the deadliness of wars, he shows how digitized history is just starting to reveal deep underlying patterns.

## 10. Comics that ask "what if?" by Randall Munroe

Web cartoonist Randall Munroe answers simple what-if questions ("what if you hit a baseball moving at the speed of light?") using math, physics, logic and deadpan humor. In this charming talk, a reader's question about Google's data warehouse leads Munroe down a circuitous path to a hilariously over-detailed answer — in which, shhh, you might actually learn something.

Source: www.ted.com