The beautiful, brainy screen sirens whose scientific inventions saved lives 23 Apr, 2021 03:04 AM 14 minutes to read Justine Johnstone in 1921. Photo / Getty Images By: Donna Fleming Once considered "the most beautiful woman in America", silent-movie and Broadway actress Justine Johnstone Wanger turned her talents to life-saving medical research. By Donna Fleming. Next time you're in hospital having drugs administered via an intravenous drip, you may want to say a quiet thank you to Justine Johnstone Wanger. Ninety years ago, Wanger and two colleagues published a ground-breaking paper in the Journal of the American Medical Association (JAMA) called "Influence of Velocity on the Response to Intravenous Injections". It discussed how best to safely deliver drugs to treat diseases such as syphilis without inadvertently killing the patients.