"Houston, we have a problem ..."

You Need Math ... (3 min. 9 sec.)

Probability ... (31 sec.)

Probability ... (30 sec.)

One Billion is Big ... (3 min. 13 sec.)

Powers of 10 ... (8 min. 29 sec.)

Don't Let This be You ... (2 min. 14 sec.)

Did You Know? (Winnipeg Remix) ... (7 min. 41 sec.)

Statistician Peter Donnelly on TEDTalks ... (22:06)

Statistician Peter Donnelly explores the common mistakes humans make in interpreting statistics, and the devastating impact these errors can have on the outcome of criminal trials.

Physicist Garrett Lisi: A beautiful new theory of everything on TEDTalks ... (21:26)

Physicist and surfer Garrett Lisi presents a controversial new model of the universe that -- just maybe -- answers all the big questions. If nothing else, it's the most beautiful 8-dimensional model of elementary particles and forces you've ever seen.

Mathematician Ron Eglash: African fractals, in buildings and braids on TEDTalks ... (16:51)

"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.

Mathematician Arthur Benjamin: Lightning calculation and other "Mathemagic" on TEDTalks ... (15:14)

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.

Psychologist Dan Gilbert: Exploring the frontiers of happiness on TEDTalks ... (33:38)

Dan Gilbert presents research and data from his exploration of happiness -- sharing some surprising tests and experiments that you can also try on yourself.

Marcus du Sautoy: Symmetry, reality's riddle on TEDTalks ... (18:19)

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.