Nov. 20: In the second big change in women's cancer screening guidelines to be issued this week, a prominent physicians group says young women do not need a cervical cancer screening test before age 21. NBC Chief Medical Editor Dr. Nancy Snyderman reports.(Nightly News)

Nov. 20: New numbers on reported swine flu cases show the epidemic may have reached its peak in the U.S. NBC's Robert Bazell reports.(Nightly News)

Nov. 20: Senate leaders need complete loyalty from Democrats in Saturdays vote, but as of late Friday two moderate Democrats had not yet committed. NBC's Kelly O'Donnell reports.(Nightly News)

Nov. 20: Oprah Winfrey's longtime fans from Chicago reacted to the news Friday that she'll be pulling the plug on the her syndicated show after 25 years as daytime TV's top diva. NBC's Kevin Tibbles reports.(Nightly News)

Nov. 20: Korean car maker Kia began production this week at a non-union plant in a struggling Georgia textile town, bringing much-needed jobs to an area where unemployment tops 12 percent. NBC's Thanh Truong reports.(Nightly News)

Nov. 20: The second installment in the wildly popular "Twilight" series raked in more than $26 million at its midnight premiere, making it one of the biggest-ever movie openings. NBC's Lee Cowan reports.(Nightly News)

Nov. 20: Using cameras mounted inside cages, Zoo TV harnesses the remarkable power of animals to make sick kids feel better. NBC's Jeff Rossen reports.(Nightly News)