Closed Captioning ON OFF apply | reset x Text Display Background Enhancements font Times New Roman Arial Comic Sans size T T T T color share link June 12th, 2014 Scientists create mutant flu virus Researchers at the University of Wisconsin have created an infectious mutant flu virus in their lab to learn how pandemics start, and how to design better flu vaccines. More video Sponsored Content Now Playing Average US mortgage rate falls for 5th straight week Sponsored Content Now Playing 54 million Americans may be mislabeled 'overweight' or 'obese' Sponsored Content Now Playing Study: Whooping cough booster doesn't give suitable protection Sponsored Content Now Playing Virginia Tech students 'carefully planned' killing of 13-year-old, police say Cold and flu Now Playing Sorting through common winter health myths and old wives' tales Now Playing Cold remedies: What works, what doesn't of honey, Vitamin C, more Now Playing The man-flu is real?! Why men's flu symptoms may actually be worse Now Playing Store-brand cold syrup medicine recall expands nationwide TRENDING Now Playing Can you tell who's the mom and who's the daughters? Now Playing Catch up on the biggest stories of the week with The Download Now Playing Ryan Reynolds reveals his baby daughter was named after his late father Now Playing Drew Barrymore: Trying to be hot constantly Is 'exhausting' Most Watched Now Playing Sponsored Content Can you tell which way this bus is traveling? Now Playing Sponsored Content Somalia plane explosion 'likely' caused by bomb; explosive residue found Now Playing Sponsored Content Security forces unite in force for Super Bowl 50 Now Playing Sponsored Content Catch up on the biggest stories of the week with The Download Now Playing Sponsored Content Virginia Tech students 'carefully planned' killing of 13-year-old, police say Now Playing Sponsored Content Deadly 6.4-magnitude earthquake strikes Taiwan Now Playing Sponsored Content Can you tell who's the mom and who's the daughters?