Historical clue formulations

• Human as opposed to an animal, notably — 2008-08-23
• Logician — 2006-11-16
• Logician — 2004-02-08
• Logician — 2002-04-17
• Mr. Spock, notably — 2001-09-14
• Syllogist — 1997-03-15
• Logician — 1994-07-20
• Logical newsman? — 1993-11-22