What is a Leap Year?

I was going to answer this question myself, but then @Ms_Elevator posted a link to this, which does it better.

The Actual Maths

A Hénon Map Inspired by an Artwork Inspired by a Hénon map - As part of my maths in museums work I was talking to someone at the National Galleries of Scotland. The world of art lies a little outside my comfort zon...
◼️ Tom⇒maths

How to Use a Spreadsheet to Batch-Upload Events to Your Calendar - The other day I posted... One of my favourite things I've discovered this year is using a spreadsheet to batch-add things to my calendar. Such a timesaver!...