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 raft was named "Kon-Tiki" after the Inca sun god, Viracocha, for whom "Kon-Tiki" was said to be an old name. ""
Relevant evidence: No