# What’s hot and what’s not, Issue 01

400

“A blackboard, for a mathematician, is an unrivalled way to communicate” – Cédric Villani, Fields Medallist 2010

Blackboards

The mathematical equivalent of a Little Black Dress. Blackboards will never go out of style.

E-learning systems

In the immortal words of the Black Eyed Peas, interactive whiteboards are so two thousand and late.

Pi approximation day

Because everyone knows that 22/7 is a better approximation to π than 3.14.

Pi day

The American date format is totally illogical. Plus, pi day is too mainstream now.

Stop smiling, Fibonacci, you are so boring. And Fibonacci isn’t even your name, for crying out loud.

Iccanobif numbers

$x_0=1$, $x_1=1$, $x_{n+1}=\operatorname{reverse}(x_n)+\operatorname{reverse}(x_{n-1})$.  I’ll let you work out its amazing properties for yourself.

Fibonnaci numbers

Rabbits, golden ratio, spirals, sunflowers, blah blah blah. We’ve heard it all before!

400

• ### 24 December

It's the last day of the Chalkdust advent calendar, so there must be something very good behind today's door...
• ### What’s your favourite set?

Here we have collected our favourite sets, from the Mandelbrot set to the Mahut-Isner set!
• ### Top ten vote issue 04

Vote for your favourite part of a circle
• ### Issue 04

Our sparkly new edition, out now! Problem solving 101, proof by storytelling, plus the return of all your favourite fun pages.