DM-Ice has a recent result looking at annual modulations of muon signals in NaI crystals. DM-Ice is basically intended to be DAMA at the South Pole, where the different location could help provide hints about what is causing DAMA’s annually modulating signal. One common thought is that this is somehow related to the annually modulating signal of muons created by cosmic ray showers high in the atmosphere. This paper looks at both muons and phosphorescence caused by muons, and concludes that the signals from these aren’t enough to explain the DAMA signal. So, this seems to rule out one possible explanation for the DAMA signal.