We chat to Marcus about science communication, teaching mathematics in schools, and how to make group theory sound sexy.

Win £100 of Maths Gear goodies by solving our famously fiendish crossnumber

Behind today's door... a quiz!

Solve the puzzles that appeared in Issue 04.

Here is the reason why the golden era of Twitter is gone

Some mathematical questions you might have wondered every time you look at one of those rainbows