 You're listening to The Native Problem, tonight's attraction on X-1. Friends, for as many years as any of us can remember, the sadness that polio has brought to so many homes has been almost unparalleled. But a greater sadness than this lies ahead for any who may from now on catch polio, because it may be due to carelessness. Vaccination against polio, the well-known sock shots, is more than 75% effective.