symmetry
If you're interested in maths then Marcus du Sautoy does not really need an introduction: he is well known for his TV and radio appearances and popular maths books. And he's also written for Plus in the past. In this interview he chats about his work as a mathematician and maths populariser. 
Imaginary is an interactive mathematics exhibition that inspires the imagination with beautiful images. And what is more exciting it allows anyone to step into the world of maths and play with beautiful mathematical surfaces, symmetry and much more. We went along to the Imaginary Barcelona conference, which brought together people involved in the original exhibition in Germany and its recent successful run throughout Spain. 
E8 symmetry discovered in lab for the first time


Squares do it, triangles do it, even hexagons do it — but pentagons don't. They just won't fit together to tile a flat surface. So are there any tilings based on fiveness? Craig Kaplan takes us through the fivefold tiling problem and uncovers some interesting designs in the process.


Winner of the general public category. Enormous is the right word: this theorem's proof spans over 10,000 pages in 500 journal articles and noone today understands all its details. So what does the theorem say? Richard Elwes has a short and sweet introduction.
