Question: What 1947 journey by raft across the Pacific Ocean from South America to the Polynesian islands was Thor Heyerdahl notable for?
Sentence (from "Thor Heyerdahl"): Thor Heyerdahl (] ; October 6, 1914 – April 18, 2002) was a Norwegian adventurer and ethnographer with a background in zoology, botany, and geography.
Relevant evidence: Yes