Solve this ‘wordoku’ in the same way as a sudoku with letters instead of numbers (each of the nine letters in each row, column and nine-square cell). Once solved, one of the overall diagonals can be rearranged into the name of a Nobel laureate whose breakthrough idea came to him while eating dinner in a fast food restaurant in 1971.
This week’s letters are: A B E L M R S T U

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