Two mathematicians' visit to the desert sheds new light on avalanches.

Observers are, of course, vital in physics: we test our theories by comparing them to our observations. But in cosmology, as Jim Hartle explains, we could be one of many possible observers in the Universe and knowing which one we are is vital in testing our theories.

Where planets are born is not necessarily where they will stay…

What is 1-1+1-1+1-1+...? How infinite sums challenge our notion of arithmetic.

Our image of the week is made of 2000 line segments.

How to write down unimaginably large numbers using just a few symbols.

Our image of the week shows mathematical street art.

Our images of the week show the amazing snow art created by Simon Beck.

Why maths is an important tool in the fight against Ebola.

Why do we add fractions the way we do? A very close look at addition reveals the answer — and it also works for negative numbers.

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