Chicago is the rattiest city in America, according to pest control company Orkin. The company released a top 20 list with Los Angeles, Washington D.C. and New York City trailing Chicago. “Each city on this list is a major urban area that provides ideal conditions for rats and mice to thrive,” said entomologist and Orkin Technical Services Director Ron Harrison, Ph.D. in the release. The list was based soley on the number of treatments performed by Orkin in the past year. Orkin estimates rats and mice invade 21 million American homes each year and one-third of Americans saw a rodent...