What is a Virus? | Breakthrough

Scientists at USAMRID, the U.S. Army Medical Research Institute of Infectious diseases, work with some of the most deadly forms of life on earth, killer viruses. Learn more. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Watch all clips of Breakthrough here: http://bit.ly/WatchBreakthrough About Breakthrough: Breakthrough provides a thought-provoking and imaginative perspective on scientific discovery as it unfolds. Each episode follows scientific explorers working on cutting-­edge projects with breakthrough potential. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possi