Sci-Fi Duologies I Want to Read

In a world of trilogies and series, here is a list of Sci-Fi Duologies (2-book-series) that I am hoping to read soon. I realize I forgot Dan Simmons Ilium/Olympos Duology. Can you tell me any others I forgot?

#scifibooks #duologies #booktube
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CHAPTERS:
00:00 - Intro
00:49 - Succession
02:34 - CommonWealth Saga
05:06 - Forge of God
06:35 - Darwin's Radio
08:37 - Smythe
10:01 - New Springtime
12:57 - Outriders
14:14 - Jurassic Park
16:05 - Expert System
17:32 - Our Lady of Endless Worlds