The Crossword of the Great Scientists!

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Across
  1. 4. Periodic table of elements
  2. 5. Telephone
  3. 7. Radioactivity
Down
  1. 1. Printing
  2. 2. "Pap smear"
  3. 3. Developer of the first vaccine
  4. 4. S.O.S.
  5. 6. ...Brothers. Invented the aeroplane