Like fossils for creationists, these medical dinosaurs are concrete evidence of the tragic fallacy of anti-vaccinationism. During the 1940s and 50s entire hospital wards were filled with these terrifying looking submarine-like devices, to help polio victims whose paralysis rendered them unable to breath.Although modern day respirators tend to work with positive rather than negative pressure, polio itself has been almost entirely eradicated due to the successful widespread use of vaccines, saving countless lives.