Possible Clues:

• Systematic way of reaching the wrong conclusion with confidence, in a version of Murphy’s Law
• Puzzle solver's skill
• Formal reasoning
• Reason American soldier cuts hair short
• Left over fag rolled — it helps me think clearly
• Deductive skill
• Spock’s specialty
• Look at American soldier with cold reason
• Lots of girls in class using heads for reasoning
• Reason to record one Conservative