Related Clues:

• Reasoned thinking
• Sudoku solver's need
• Need for KenKen
• Spock trademark
• Deductive reasoning
• Mr. Spock's strong suit
• Sudoku skill
• Boolean ___
• Sound thinking
• Aristotle forte
• Science of animals
• The science of reasoning
• The science of reasoning correctly
• Science of correct reasoning
• The scientific study of animals