Jonas Salk puzzle

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Across
  1. 2. when did Jonas Salk release the vaccine?
  2. 4. when was Jonas Salk born?
  3. 6. when did Jonas Salk die?
Down
  1. 1. when was did polio began?
  2. 3. when did Jonas Salk invent the polio vaccine?
  3. 5. did Jonas Salk make any many from the polio vaccine?