It’s so cold in Russia that people are doing the #dubakchallenge, or #freezingcoldchallenge. That involves throwing buckets of hot water in the air -- which freeze into clouds of ice, suspended for a few moments in mid-air. Some people even add dyes to the water for added effect. To do the challenge right, it shouldn’t be any warmer than -20 degrees Celsius. And that’s no problem in Russia right now, where temps have dipped as low as -30 degrees Celsius this winter.