Two mutations in the H1N1 avian flu virus were responsible for killing 50 million people all over the world during the 1918 outbreak of so-called Spanish Flu. Now researchers at MIT have analyzed 90-year-old blood samples from people who survived the flu, and the blood still contains antibodies that react to H1N1 viruses. Could this be the key to preventing another outbreak of this deadly avian flu? [Daily Galaxy]