The perfect Christmas tree

Nicole Wrightham and Alex Craig, students in mathematics at the University of Sheffield, have created a formula to calculate the number of balls to hang on a Christmas tree. The formula also determines the height of the angel, and the length of the garlands and even the number of lights.

Whether you decide to trust to your intuition, or let yourselves be guided by the formula, the EPS would like to wish all of its members, and all of the readers of e-EPS a wonderful holiday season.