## Welcome to Plus magazine!

How do you describe the curvature of space?

El Niño is a climate event without equal, causing droughts, floods, hurricanes and typhoons around the globe. How can we understand and predict it?

To celebrate the centenary of the general theory of relativity we asked physicist David Tong to explain the theory and the equation that expresses it. Watch the video or read the article!

Image: Robert Hurt, NASA/JPL-Caltech.

Read about the rocky road to one of Einstein's greatest achievements: the general theory of relativity, which celebrates its centenary this year.

Global coordinates, how to work out your latitude by the stars, and the problem with longitude.

A brief introduction to *bits* and why they're not the same as 0s and 1s.

What are mathematical proofs, why do we need them and what can they say about sheep?

Can you measure information? It's a tricky question — but people have tried and come up with very interesting ideas.