Home > General Knowledge > Important Dates and EventsWhat year did the first successful polio vaccine become available?A. 1955 B. 1953 C. 1954 D. 1956Answer: 1955Additional Information: The first polio vaccine was declared safe and effective in 1955. Subjects: Important Dates and Events, General KnowledgeRelated MCQsWhat year did the first Iraq War start?In what year did Martin Luther King Jr. deliver his ‘I Have a Dream’ speech?What year was the first online social networking site launched?What year was the first computer invented?What year was the first successful email service launched?When was the first successful full-length feature film made?When was the first telephone call made?What year did the Space Shuttle Challenger disaster occur?What year did YouTube launch?What year was the first artificial intelligence program created?What year was the first human organ transplant conducted?What year did the first widely used graphical web browser, Mosaic, get released?When was the first social media platform launched?What year did the first text message get sent?What year did the first successful use of CRISPR technology occur?