This source is a non-profit organization, educational web where scientists provide answers to commonly asked science questions. One question asked was "Are Viruses Alive?", and was answered by Catherine Mansfield. Catherine is a Research Associate at Imperial College London, where she studies in heart failure, stem cell therapy, biophysics, and cardiac physiology, and has received her masters and PhD there. The author is credible because she has done extensive research in her major that revolves around characteristics of life. Her explanation includes both arguments of whether or not viruses are alive, or not alive. After presenting both sides of arguments, she then presents the generally accepted view that viruses are not alive, and then inserts