On 9 January 2016, Professor Peter Gavin Hall died, bringing great sadness to the mathematical community. For aside from his profound academic talent and contributions, he is remembered and missed for his immense and yet gentle generosity. Why is it that mathematics seems to attract kind and generous leaders?
We are experiencing the most glorious Golden Age of mathematics ever in history.
And yet, mathematics is also at a low.
I am proud to present three excellent articles in this issue: a beautiful survey of how to tile the plane with certain pentagons; a fascinating overview of Fibonacci numbers and how they relate to the golden ratio; and a fun and interesting introduction to cryptarithmetic puzzles.