Following a weekend of record cold for much of the eastern U.S., we're defining the term bombogenesis and showing you significant snow in places that seldom see it. We're also explaining why there's been another partial shutdown in the U.S. government (though this one is unlikely to last long). A field trip to Spain, a van encased in ice, and a quadriplegic farmer in China are some of our other subjects. Plus: remembering the Treaty of Guadalupe Hidalgo and the world's first public toilet.