Explanation:

- Linus Carl Pauling: Pauling won two Nobel Prizes, but in different categories—Chemistry in 1954 and the Peace Prize in 1962.

- Roger D. Kornberg: Kornberg won the Nobel Prize in Chemistry in 2006.

- Madame Curie: She won two Nobel Prizes in physics in 1903 and chemistry in 1911 but not twice in chemistry.

- Frederick Sanger: Sanger is the only person to have won the Nobel Prize in Chemistry twice, in 1958 and again in 1980.

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