’Tis the season: Britain’s University of Sheffield has invented treegonometry, the mathematics of creating a harmonious Christmas tree, a perfect balance of green and glitz. There is a mathematical formula involving square roots, pi and tinsel, but never mind, the university’s website offers a calculator (in centimeters) at http://tinyurl.com/xtreeformula. However, the formula only tells you how much to add, not where to harmoniously place things. For that, you and the tinsel are on your own.
In One Ear: In perfect harmony
Tree decorating down to a science