The DDT theory, like the lead arsenate observation, failed because it wrongly dismissed the equally important role of the virus itself. It could not account for the prompt collapse of polio in the U.S. after the vaccine was developed. The vaccine clearly eliminated outbre...
Hazel Fellows sews pieces of an Apollo A7L spacesuit on the production line at International Latex Corporation (ILC) in 1968. Most Americans learn as schoolchildren that Jonas Salk was the genius beh...
Hayes and Laws also used a secondary evaluation, DDT intake per day, to explain that from 1954 to 1964-67, DDT ingestion decreased by an approximate factor of five. Significantly, the Salk vaccine program began in 1954. The observed decrease in the concentration of DDT in food (Walker et a...