Who is the only person to have been awarded two unshared Nobel Prizes?

Linus Pauling was a chemist who contributed immensely to the knowledge of chemistry and biological molecules. For his research on the chemical bonds and their application to find out the structure of complex molecules, he was awarded the Nobel Prize in Chemistry in 1954. Since 1946, Pauling had ceaselessly championed against the nuclear tests and all forms of war, which was used as a means to solve national and international conflicts, for which he was awarded the Nobel Peace Prize in 1962.