How did Isaac Asimov decide to introduce the concept of Earth's ancient past into this story?
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Pebble in the Sky

Pebble in the Sky
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How did Isaac Asimov decide to introduce the concept of Earth's ancient past into this story?
Did anyone else feel the pacing dragged a bit in the middle, or was that just me?
What themes do readers think Asimov was really exploring through the protagonist's journey?