## wave

A massive earthquake hit Japan earlier today, registering 8.9 on the Richter scale and the largest ever recorded for Japan. The tsunami triggered by the quake brought a 10m high wall of water in northern Japan, and other countries are now waiting for it to hit their shores.

But what causes earthquakes and tsunamis and what can we do to protect ourselves from their destructive power?

**Chris Budd and Cathryn Mitchell**look at the maths that isn't only responsible for these medical techniques, but also for much of the digital revolution.

*Plus*that it doesn't matter what anyone else thinks. You can follow your dreams to do maths and it can lead you to the skies.

**Jeffrey Rosenthal**follows Galileo's observation that the entire universe is written in the language of mathematics - and that includes music.

**Michael McIntyre**explores the underlying wave mathematics.

**Frances Elwell**looks at the eddies and currents, from the pungent problem of sewage outflow to the search for bodies of people who have fallen into rivers, explaining that fluid mechanics lies behind it all.