Stanislav Petrov

On September 26, 1983, he was the duty officer at the command center for the Oko nuclear early-warning system when the system reported that a missile was being launched from the United States. Petrov judged the report to be a false alarm,and his decision is credited with having prevented an incorrect retaliatory nuclear attack on the United States and its NATO allies that could have resulted in large-scale nuclear war. Investigation later confirmed that the satellite warning system had indeed malfunctioned.

Maurice Ralph Hilleman 

(August 30, 1919 – April 11, 2005) was an American microbiologist who specialized in vaccinology and developed over 36 vaccines, more than any other scientist. Of the 14 vaccines routinely recommended in current vaccine schedules, he developed eight: those for measles,mumps, hepatitis A, hepatitis B, chickenpox,meningitis, pneumonia and Haemophilus influenzaebacteria. He also played a role in the discovery of the cold-producing adenoviruses, the hepatitis viruses, and the cancer-causing virus SV40.

He is credited with saving more lives than any other medical…