I always hated square roots; we should ban them, for the sake of the children: On the afternoon of Feb. 20, detectives investigated a report of terroristic threats at the school, where they learned that a student had been completing a math problem that required drawing the square-root sign. Students in the group began commenting that the symbol, which represents a number that when multiplied by...

## Who knew Art Garfunkel was a mathematician?

He also does a lot of mathematics, having read it as a student at Columbia. “I’m precise. I think in proportions. I play games with numbers and I proportionalise. I imagine we have now done 1/8th of our interview.” I check my watch. He even took a job as a maths teacher at one point, in the Seventies, despite being a world famous pop star. “I’d just got married and moved to Connecticut, and there...

## Using math to look smart in meetings

From the Cooper Review. The percentage one is now in my toolbox.

## The key to Napoleon’s success

Napoleon excelled at mathematics. ‘To be a good general you must know mathematics,’ he later observed, ‘it serves to direct your thinking in a thousand circumstances.’ He was helped by his prodigious memory. ‘A singular thing about me is my memory,’ he once boasted. ‘As a boy I knew the logarithms of thirty or forty numbers.’ Napoleon was given...

## Mathematics via mime

This article has inspired me to teach my entire causal inference class next fall via mime: Without saying a word, a man walks on stage carrying a case full of small plungers. Each time he reaches in the case to take some plungers out, he tries to array them in order on a table in front of him, but he always has one left over. Five, seven, 13: No matter what number, there is still that one left...