Question: What 1947 journey by raft across the Pacific Ocean from South America to the Polynesian islands was Thor Heyerdahl notable for?
Sentence (from "Kon-Tiki expedition"): The "Kon-Tiki" expedition was a 1947 journey by raft across the Pacific Ocean from South America to the Polynesian islands, led by Norwegian explorer and writer Thor Heyerdahl.
Relevant evidence: Yes