As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

Last weekend's winter storm dumped snow and ice across the South, but some people also experienced loud booms and felt their homes shake because of a weather phenomenon called "frost quake." ...

Add Yahoo as a preferred source to see more of our stories on Google. While many 'mysterious' natural phenomena have been unraveled by science, there remain a few that sit stubbornly outside our ...