Kon-Tiki: Across the Pacific by Raft
What initial observation led Heyerdahl to develop the theory about the Pacific Islands in the nonfiction book, Kon-Tiki: Across the Pacific by Raft?
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On an expedition with his wife Heyerdahl discovered that the trade winds blew from east to west, suggesting that the settlers on the islands may have come from South America.
Kon-Tiki: Across the Pacific by Raft