John Baez, physicist, writes on ecology and mathematical physics.
Azimuth's Latest Posts
I try to focus on serious problems in this blog, mostly connected with environmental issues and the attempt to develop ‘green mathematics’. But I seem unable to resist including some random fun stuff. Like this: Let’s say the diameter of a region in the plane is the maximum distance between two points. You all know […]
SETI means ‘Search for Extraterrestrial Intelligence’, and I’m giving a talk at the SETI Institute on Tuesday December 17th, from noon to 1 pm. You can watch it live, watch it later on their YouTube channel, or actually go there and see it. It’s free, and you can just walk in at 189 San Bernardo […]
The hypocycloid with n cusps is the curve traced out by a point on a circle rolling inside a circle whose radius is n times larger. The hypocycloid with 2 cusps is sort of strange: It’s just a line segment! It’s called the Tusi couple. The hypocycloid with 3 cusps is called the deltoid, because […]
Over a year ago, I wrote here about ice. It has 16 known forms with different crystal geometries. The most common form on Earth, hexagonal ice I, is a surprisingly subtle blend of order and randomness: Liquid water is even more complicated. It’s mainly a bunch of molecules like this jostling around: But you may […]
Have you ever seen one of these? It’s a Monarch Butterfly. Every spring, millions fly from Mexico and southern California to other parts of the US and southern Canada. And every autumn, they fly back. On the first of November, called the Day of the Dead, people celebrate the return of the monarchs to the […]
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