This is so very well done.

Very slick explainer that uses no math whatsoever. I used to do a similar presentation at work to new engineers.

This is a mechanical computer that can do Fourier analysis on signals using gears. This math is the basis for all modern telecommunications and is nowadays done electronically. It's amazing to see it done mechanically. The guy who designed it is the same guy who measured the speed of light in the famous Michelson-Morley experiment. Parts 3 to 4: http://www.youtube.com/watch?v=8KmVDxkia_w http://www.youtube.com/watch?v=6dW6VYXp9HM http://www.youtube.com/watch?v=jfH-NbsmvD4

Now that we know this, mankind can rest easy.

A mathematician looks at the obesity epidemic in the US. Math is a great tool to abstract and model reality in a way in which opinion and sentiment does not get in the way. Very interesting article.