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Crossnumber winners, issue 13
Did you solve it?
In conversation with Clifford Cocks
We chat to the crypto chief about inventing RSA... but not being able to tell anyone
On the cover: Harriss spiral
Find out more about the spiral trees on the cover of Issue 09
Summer puzzles
Have a go at these puzzles, adequate for your holidays!
In conversation with Marcus du Sautoy
We chat to Marcus about science communication, teaching mathematics in schools, and how to make group theory sound sexy.
Interstellar travel
Investigate the mathematics of wormholes