Before we begin, I am perfectly aware that the whole Days of Christmas thing is referring to the days after the former pagan holiday, but I cite as precedent to my usage the fact that Forlow herself titled her first post of the series 12 Days of Christmas Giveaway – Day 1.
The question for this first day is: What’s your favorite Christmas song? Before we dive in, note the latest xkcd:
Planetary magnetic fields – particularly that of mercury – are a recurring topic for DpSUs. Thursday’s article, when it eventually appeared, was called What Magnetized the Moon?
In mid November in Nature there were two papers discussing possible causes of the Moon’s long-decayed magnetic field, along with another article about both papers. Curiously, Brian Thomas only discusses one of these papers.