No school today as the temperature was below 0F and the wind chill was -20F. The polar vortex was to blame for the coldest air in almost 20 years. My son and I wanted to try the boiling water in the cold air demo that we often see posted by those in the upper Midwest. The science behind it is pretty cool. Here is our video. Particulars: Outside temperature was -1F, Relative Humidity was 47% and the dew point was -16F.