Which Prize Did They Win?

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Across
  1. 4. Pearl S. Buck: stories and writings on Chinese culture
  2. 5. Albert Einstein: work on theoretical physics
Down
  1. 1. Marie Curie: discovery of the chemicals called radium and polonium
  2. 2. Alexander Fleming: discovery of penicillin, an important medication to fight infection
  3. 3. Nelson Mandela: fighting and resisting racist policies in South Africa