Question:
Thor Heyerdahl (Norwegian pronunciation: [tu:r 'haei@da:l]; October 6, 1914 - April 18, 2002) was a Norwegian adventurer and ethnographer with a background in zoology, botany, and geography. He became notable for his Kon-Tiki expedition in 1947, in which he sailed 8,000 km (5,000 mi) across the Pacific Ocean in a hand-built raft from South America to the Tuamotu Islands. The expedition was designed to demonstrate that ancient people could have made long sea voyages, creating contacts between separate cultures. This was linked to a diffusionist model of cultural development.
In 1947, Heyerdahl and five fellow adventurers sailed from Peru to the Tuamotu Islands, French Polynesia in a pae-pae raft that they had constructed from balsa wood and other native materials, christened the Kon-Tiki. The Kon-Tiki expedition was inspired by old reports and drawings made by the Spanish Conquistadors of Inca rafts, and by native legends and archaeological evidence suggesting contact between South America and Polynesia. The Kon-Tiki smashed into the reef at Raroia in the Tuamotus on August 7, 1947, after a 101-day, 4,300-nautical-mile (5,000-mile or 8,000 km) journey across the Pacific Ocean. Heyerdahl had nearly drowned at least twice in childhood and did not take easily to water; he said later that there were times in each of his raft voyages when he feared for his life.  Kon-Tiki demonstrated that it was possible for a primitive raft to sail the Pacific with relative ease and safety, especially to the west (with the trade winds). The raft proved to be highly manoeuvrable, and fish congregated between the nine balsa logs in such numbers that ancient sailors could have possibly relied on fish for hydration in the absence of other sources of fresh water. Other rafts have repeated the voyage, inspired by Kon-Tiki. Heyerdahl's book about The Kon-Tiki Expedition: By Raft Across the South Seas has been translated into 70 languages. The documentary film of the expedition entitled Kon-Tiki won an Academy Award in 1951. A dramatised version was released in 2012, also called Kon-Tiki, and was nominated for both the Best Foreign Language Oscar at the 85th Academy Awards and a Golden Globe Award for Best Foreign Language Film at the 70th Golden Globe Awards. It was the first time that a Norwegian film was nominated for both an Oscar and a Golden Globe.  Anthropologists continue to believe that Polynesia was settled from west to east, based on linguistic, physical, and genetic evidence, migration having begun from the Asian mainland. There are controversial indications, though, of some sort of South American/Polynesian contact, most notably in the fact that the South American sweet potato is served as a dietary staple throughout much of Polynesia. Blood samples taken in 1971 and 2008 from Easter Islanders without any European or other external descent were analysed in a 2011 study, which concluded that the evidence supported some aspects of Heyerdahl's hypothesis. This result has been questioned because of the possibility of contamination by South Americans after European contact with the islands. However, more recent DNA work (after Heyerdahl's death) contradicts the post-European-contact contamination hypothesis, finding the South American DNA sequences to be far older than that. Heyerdahl had attempted to counter the linguistic argument with the analogy that he would prefer to believe that African-Americans came from Africa, judging from their skin colour, and not from England, judging from their speech.
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did was special about the expedition?

Answer:
The Kon-Tiki expedition was inspired by old reports and drawings made by the Spanish Conquistadors of Inca rafts,

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William McKinley (January 29, 1843 - September 14, 1901) was the 25th President of the United States, serving from March 4, 1897 until his assassination in September 1901, six months into his second term. McKinley led the nation to victory in the Spanish-American War, raised protective tariffs to promote American industry, and maintained the nation on the gold standard in a rejection of free silver (effectively, expansionary monetary policy). McKinley was the last president to have served in the American Civil War, and the only one to have started the war as an enlisted soldier, beginning as a private in the Union Army and ending as a brevet major.
William McKinley Jr. was born in 1843 in Niles, Ohio, the seventh child of William McKinley Sr. and Nancy (nee Allison) McKinley (1809-1897). The McKinleys were of English and Scots-Irish descent and had settled in western Pennsylvania in the 18th century, tracing back to a David McKinley who was born in Dervock, County Antrim, in present-day Northern Ireland. There, the elder McKinley was born in Pine Township, Mercer County.  The family moved to Ohio when the senior McKinley was a boy, settling in New Lisbon (now Lisbon). He met Nancy Allison there, and married her later. The Allison family was of mostly English descent and among Pennsylvania's earliest settlers. The family trade on both sides was iron-making, and McKinley senior operated foundries throughout Ohio, in New Lisbon, Niles, Poland, and finally Canton. The McKinley household was, like many from Ohio's Western Reserve, steeped in Whiggish and abolitionist sentiment, the latter based on the family's staunch Methodist beliefs. William followed in the Methodist tradition, becoming active in the local Methodist church at the age of sixteen. He was a lifelong pious Methodist.  In 1852, the family moved from Niles to Poland, Ohio so that their children could attend the better schools there. Graduating from Poland Seminary in 1859, he enrolled the following year at Allegheny College in Meadville, Pennsylvania. He remained at Allegheny for only one year, returning home in 1860 after becoming ill and depressed. He also spent time at Mount Union College in Alliance, Ohio as a board member. Although his health recovered, family finances declined and McKinley was unable to return to Allegheny, first working as a postal clerk and later taking a job teaching at a school near Poland, Ohio.

Who did he marry?
Nancy Allison