I read a news article about a farmer who went out to check his barn when it was -2 degrees F and his thymus gland swole up from the extreme cold and he choked to death. It's going to be minus 20 degrees F and that scares me a lot. I found the article in the Google News Archives , and the headline was ' man suffocates in cold ' or something along the lines of that . Any thoughts? Is the cold air really that dangerous?