Today is the third of January, and the third day of the year – and since this year it also falls on a Thursday, making for excellent pun opportunities, a group of mathematicians including Jim Propp, Evelyn Lamb, Zoe Griffiths, Ben Orlin, Matt Parker and several others have chosen to use today to celebrate the number $\frac{1}{3}$ (and in America, you’d even write the date as 1/3). Today is officially Thirdsday! Celebrate by:

• reading Jim’s extensive blog post on the subject
• watching Matt’s new YouTube video
• downloading Zoe’s new Think Maths classroom resource
• reading Evelyn Lamb’s Scientific American post
• looking at Ben Orlin’s bad drawings on the topic
• searching for ‘thirdsday’ on Twitter to see what people are up to

I personally will be sketching the middle third Cantor set, as it’s my favourite fractal.