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Fold and Cut Theorem - Numberphile


The Maths Echo Chamber

You are a teacher who has realised that there is a great debate going on about education, what it is for, what we should value and what this looks …

zen habits

This year I’m going to challenge myself to go deeper by using constraints, inspired by my friend David Cain’s idea of a Depth Year.<p>What’s a Depth …

This guy traveled to every country in the world before turning 40 — here are the countries he thinks everyone should visit

So when people ask him which country was his favorite, he has a hard time picking just one.<p>But there are 12 countries he thinks everyone should visit at some point in their lives.<p>Keep scrolling to see what those countries are, and why he thinks they're worth visiting.

European Travel

Observing Lessons, So What’s Changed?

A year on from when we stopped grading individual lessons I’m wondering how much progress we have made. Just before the summer I reviewed our new …

Sigma 50mm DG HSM Art Lens Tested, See How it Stacks Up Against the Otus

Sigma made quite a splash at CES this year when the company not only announced that a 50mm f/1.4 lens would be added to its superb Art series, but …

Devlin's Angle by Keith Devlin