Most of the time when I take my dogs out at night I have to put on a headlamp (they have their own to wear too) so that I can see them in the dark. But this week the combination of a full moon and a fresh blanket of snow canceled the need for the headlamps. In the following Minute Physics video we learn why the full moon appears brighter in the winter. Hint, it’s not the snow cover that makes the big difference.