Bernardo Putairi, and the annexation was approved by the President of France on 30 January 1882. In the 20th century, in July 1966, the Mangareviens were exposed to radioactive fallout due to the French military's nuclear tests at Moruroa and Fangataufa. Military officials were aware of the doses received by the island and their effects, but kept them secret. The information was made public in 1998 by journalist Vincent Jauvert, and acknowledged by the French government in 2006. Geography Climate Mangareva has a tropical rainforest climate (Köppen climate classification Af). The average annual temperature in Mangareva is . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in March, at around , and lowest in August, at around . The highest temperature ever recorded in Mangareva was on 6 March 2016; the coldest temperature ever recorded was on 27 August 1992. Transportation Mangareva is reached by boat from the nearby airport across the lagoon. Mangareva is an important travel link to Pitcairn Island. Practically the only way a traveler can reach Pitcairn Island is to fly to Tahiti, then to Mangareva. From there, a 32-hour boat ride will take the traveler to the island. Some reach Pitcairn by commercial shipping traffic, but that is uncommon, because shipping lanes do not typically pass close to Pitcairn. Culture and fiction Painter and author Robert Lee Eskridge's book Manga Reva: The Forgotten Islands (Bobbs Merrill; 1931) offers first-hand observations of the environment, peoples, and traditions of Mangareva. It includes original illustrations and photographs by the author. In 1962, the adventure-fiction writer Garland Roark acknowledged Eskridge's work in a foreword to his novel, The Witch of Manga Reva. Eskridge also wrote and illustrated a children's book about his visit to Mangareva: South Sea Playmates (Bobbs Merrill; 1933). Sailor and author W. I. B. (Bill) Crealock describes in his book Cloud of Islands a visit to Mangareva, which he considered the ideal island, on the yacht Arthur Rogers, in the company of Diana and Tom Hepworth, whose lives were later recounted in the book Faraway by Lucy Irvine. Binary counting system The Mangarevan people developed a binary number system centuries ahead of Europeans. In 2013, the islanders were discovered to have developed a novel binary system that allowed them to reduce the number of digits involved in binary counting: for example, representing 150 requires eight digits in