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Roots of Unity

Roots of Unity

Mathematics: learning it, doing it, celebrating it.

The Most Breathtaking Video of the Weather You’ll Watch This Week

The Most Breathtaking Video of the Weather You’ll Watch This Week

Last Monday, the National Oceanic and Atmospheric Administration (NOAA) released a video of the past 10 years of weather in the Americas. The Geostationary Operational Environmental Satellite GOES-12, which had monitored the weather in North and South America since April 2003, was retired on August 16.

August 25, 2013 — Evelyn Lamb

What Is the Funniest Number?

“There was only one catch and that was Catch-22, which specified that a concern for one’s own safety in the face of dangers that were real and immediate was the process of a rational mind.

August 5, 2013 — Evelyn Lamb

How Much Pi Do You Need?

I am traveling for most of July. I hope you enjoy this post from the past, which originally appeared on the Observations blog on July 21, 2012. A variety of pies celebrating the number pi.

July 22, 2013 — Evelyn Lamb

Lord Kelvin and the Age of the Earth

William Thomson, 1st Baron Kelvin. Image: Smithsonian Libraries, via Wikimedia Commons. This image is in the public domain in the United States because its copyright has expired.

June 26, 2013 — Evelyn Lamb

Introducing the Blog on Math Blogs

A visualization of the twin primes using an Ulam spiral. Image: Silveira Neto. CC BY-SA 2.5 I'm pleased to introduce a new American Mathematical Society blog: the Blog on Math Blogs!

June 25, 2013 — Evelyn Lamb

Mathematicians Predict What's in Your Wallet

It's all about the Washingtons. And that smiley face button. Image: flickr user xJason.Rogersx CC BY 2.0 When I go to Europe, my pockets rapidly fill up with change.

June 20, 2013 — Evelyn Lamb

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20% off Scientific American Health & Medicine

20% off Scientific American Health & Medicine