How do we know that the universe is flat?

In less than 100 seconds, Roberto Trotta explains how astrophysicists calculate geometries in the universe.

Exploring other dimensions - Alex Rosenthal and George Zaidan

View full lesson: http://ed.ted.com/lessons/exploring-other-dimensions-alex-rosenthal-and-george-zaidan 

Imagine a two-dimensional world -- you, your friends, everything is 2D. In his 1884 novella, Edwin Abbott invented this world and called it Flatland. Alex Rosenthal and George Zaidan take the premise of Flatland one dimension further, imploring us to consider how we would see dimensions different from our own and why the exploration just may be worth it.

 Lesson by Alex Rosenthal and George Zaiden, animation by Cale Oglesby.

 

Introduction to Fourier Series

Fourier series explained with the help of rotating vectors.

 

Pi

This video discusses the history of and ongoing attempts to resolve pi. Includes a demonstration of determining pi by measuring the circumference and diameter of a circle.

 

Scientific Searches' Statistics Explained

Searching for the Higgs boson and other particles requires scientists to take into account statistics and probability in their analyses. Fermilab physicist Don Lincoln explains these concepts using simple dice.

 

Proof Without Words: The Circle

Proving the circumference of a circle is πR² using only beads and a ruler!

Other Minute Physics videos

How to Count Infinity

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There is no "Fourth" dimension

Just because there are four dimensions doesn't mean there's a "fourth dimension"

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Extra Dimensions - Sixty Symbols

We take a look at the mysterious world of extra dimensions.

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Pi - Sixty Symbols

It's more of a maths symbol, but crucial to physics too... So by popular demand, we've had a look at pi (but in Professor Eaves' unique way).

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Infinity - Sixty Symbols

It's a concept which intrigues mathematicians, but scientists aren't so keen on it.

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What is a dimension? In 3D...and 2D... and 1D

1D - it's the new 3D!

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Marcus du Sautoy: Symmetry, reality's riddle

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.

Other TED Talks

A Magic Number - Sixty Symbols

It's a tricky concept linked to chaos, but the Feigenbaum Constant is a special number which appears everywhere in nature.

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Big Numbers - Sixty Symbols

Big numbers: Avogadro's Number, number of protons in the universe, Dirac large numbers hypothesis.

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Scientific Notation - Explained!

Scientists have to work with some very large and some very small numbers. To represent these numbers more easily, they use scientific notation. Scientific notation relies on powers of 10. This video gives examples of how to represent a large and small number and explains powers of ten.

Other Veritasium videos

Eigenvalues - Sixty Symbols

From designing Google to building a bridge, eignevalues are important numbers... so important that Seamus Garvey has a fleet of computers devoted to them.

Source: Sixty Symbols

Imaginary Number - Sixty Symbols

Whether you call it "i" or "j", this is one symbol which is hard to fathom.

Source: Sixty Symbols .