In the first article in this issue, by Michael Hirschhorn, you will learn about the harmonic series
$$\sum_{k=1}^\infty \frac{1}{k}.$$
Issue 2
The first article in this issue, by Peter Donovan, tells a fascinating story of how code breakers working at Fleet Radio Unit, Melbourne (FRUMEL) during the Second World War, were able to de-code the principal Japanese Navy operational code.