Polynesian navigation snow. In the mid-20th century, Thor Heyerdahl proposed a new theory of Polynesian origins (one which did not win general acceptance), arguing that the Polynesians had migrated from South America on balsa-log boats. The presence in the Cook Islands of sweet potato that is a plant native to the Americas (called "kūmara" in Māori), which have been radiocarbon-dated to 1000 CE, has been cited as evidence that Americans could have traveled to Oceania. The current thinking is that sweet potato was brought to central Polynesia circa 700 CE and spread across Polynesia from there, possibly by Polynesians who had traveled
Kon-Tiki (2012 film) have been utilized 1,500 years ago by the indigenous peoples of the region. Though he himself cannot swim or sail, he sets out on the treacherous 4,300 nautical mile–journey across the Pacific from Peru to Polynesia aboard the small raft, along with his crew of five men (and a macaw named Lorita). During the three months aboard the primitive vessel named after Inca god of sun and storm, Kon-Tiki, the crew's scientific reenactment of the legendary voyage from the coast of Peru to the Polynesian islands is met with setbacks in the form of storms, sharks, and other perils of