Christmas in July

Christmas Days

Some of the achievements at festivities and exhibitions are greeted with surprise. It is not always possible to have the privilege of personal inspection, though those in charge of defectives are usually most ready to give of their precious leisure in showingvisitors what is being done.. The following notes giving different accounts of Christmas activities have been kindly sent to us. They may ...

Christmas disease.

Images in Christmas Balls

We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere beyond the surface of a spherical mirror, when an eye observes the image of a pointlike light source. The considered problem, originally posed by Abu Ali Hasan Ibn al-Haitham — alias Alhazen — more than a millennium ...

Christmas and Suicides in Austria

Background: Contrary to the myth that suicides increase around Christmas, multiple studies reveal that suicide rates decrease towards Christmas and return back to normal or even peak in the beginning of the new year. We aimed to replicate this effect for Austria. Methods: The analyses were based on the official suicide statistics 2000 – 2013 using Poission regression and Bayesian changepoint an...

FEATURES lead in christmas lights

introduction Humans have had a long relationship with lead. Before 1550 BCE, Egyptians used lead-based compounds for external remedies, which, according to Nriagu (1983), suggests an appreciation for lead’s toxic properties. In more recent times childhood lead poisoning was recognized as a clinical disorder in the 1920s (Maas, Patch, Pandolfo, Druhan, & Gandy, 2005), and lead was banned as an i...