The Strange Music of the Harmonic Series

The secret to the cartoon: almost ALL numbers have 9's in them.

Everything Is Linear (Or, the Ballad of the Symbol Pushers)

When you see algebraic rules as merely about moving x's and y's around a page, it's easy to fall prey to systematic errors.

Infinity shreds our intuitions.

Three times already this week, I've seen people overgeneralizing from small samples. It's an epidemic!

The word "grade" belongs on that List of Words That Change Meaning Dramatically When You Cross the Pond.

Where do you draw the line between a disposable trick and an indispensable technique?

I have slept only scattered hours, eaten only bits of eraser and pencil shavings.

Can you summarize a whole branch of mathematics in one word?

I’ve encountered some surprising disparities, each of which prompts the obvious question: Which way is better, the British or the American?

I'd never thought of questions like fossil fuel. A nonrenewable resource. But the thought kept popping back up.