Historical clue formulations

• Sci-fi writer Isaac — 2025-12-15
• "Foundation" author — 2019-01-27
• Writer after whom an asteroid and Mars crater are named — 2018-09-12
• Polymathic Isaac — 2017-11-11
• "I, Robot" author — 2017-08-09
• Author of 1980's "The Annotated Gulliver's Travels" — 2013-10-05
• "Nemesis" novelist — 2013-05-12
• "The End of Eternity" author — 2011-12-29
• "Pebble in the Sky" author — 2008-08-16
• "Nemesis" novelist — 2006-12-10
• Author of the Three Laws of Robotics — 2006-04-08
• Writer who said "I am not a speed reader. I am a speed understander" — 2004-12-02
• "The Stars, Like Dust" author — 2002-04-21
• Famed sci-fi writer — 2001-06-10
• "I, Robot" author — 2000-08-13
• "Foundation Trilogy" author — 1998-10-10
• "I, Robot" author — 1995-08-18
• "Foundation's Edge" author — 1995-07-21