Finished Wool, now about a third of the way into Shift, which tells some of the backstory before rejoining the "present." Something seems weird about the timeline, though. AFAICT from Shift, "now" is roughly 2180 - but parts of Wool talk about "centuries" spent in the silos, which would push "now" closer to the 2300s or later.
Hopefully, the later chapters (or the third book, Dust) will clear this up.
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