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Nahuatl (Nahuatl pronunciation: [ˈnaːwatɬ] ^ⓘ, with stress on the first syllable) is a group of related languages and dialects of the Nahuan (traditionally called "Aztecan") branch of the Uto-Aztecan language family. Altogether they are spoken by an estimated 1.5 million Nahua people, most of whom live in central Mexico. All Nahuan languages are indigenous to Mesoamerica.

Nahuatl has been spoken in central Mexico since at least the 7th century AD. It was the language of the Aztecs, who dominated what is now central Mexico during the Late Postclassic period of Mesoamerican chronology. During the preceding century and a half, the expansion and influence of the Aztec Empire had led to the variety spoken by the residents of Tenochtitlan becoming a prestige language in Mesoamerica. With the introduction of the Latin alphabet, Nahuatl also became a literary language and many chronicles, grammars, works of poetry, administrative documents and codices were written in the 16th and 17th centuries. This early literary language based on the Tenochtitlan variety has been labeled Classical Nahuatl and is among the most studied and best documented languages of the Americas.

Today Nahuatl varieties are spoken in scattered communities mostly in rural areas. There are considerable differences among varieties, and some are mutually unintelligible. They have all been subject to varying degrees of influence from Spanish. No modern Nahuatl languages are identical to Classical Nahuatl, but those spoken in and around the Valley of Mexico are generally more closely related to it than those on the periphery. Under Mexico's Ley General de Derechos Lingüísticos de los Pueblos Indígenas ("General Law on the Linguistic Rights of Indigenous Peoples") promulgated in 2003, Nahuatl along with the other indigenous languages of Mexico are recognized as lenguas nacionales ("national languages") in the regions where they are spoken, enjoying the same status as Spanish within their region.

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Benjamin Lee Whorf (April 24, 1897 – July 26, 1941) was an American linguist and fire prevention engineer. Whorf is widely known as an advocate for the idea that because of linguistic differences in grammar and usage, speakers of different languages conceptualize and experience the world differently. This principle has frequently been called the "Sapir–Whorf hypothesis", after him and his mentor Edward Sapir, but Whorf called it the principle of linguistic relativity, because he saw the idea as having implications similar to Einstein's principle of physical relativity.

Throughout his life Whorf was a chemical engineer by profession, but as a young man he took up an interest in linguistics. At first this interest drew him to the study of Biblical Hebrew, but he quickly went on to study the indigenous languages of Mesoamerica on his own. Professional scholars were impressed by his work and in 1930 he received a grant to study the Nahuatl language in Mexico; on his return home he presented several influential papers on the language at linguistic conferences. This led him to begin studying linguistics with Edward Sapir at Yale University while still maintaining his day job at the Hartford Fire Insurance Company. During his time at Yale he worked on the description of the Hopi language, and the historical linguistics of the Uto-Aztecan languages, publishing many influential papers in professional journals. He was chosen as the substitute for Sapir during his medical leave in 1938. Whorf taught his seminar on "Problems of American Indian Linguistics". In addition to his well known work on linguistic relativity, he wrote a grammar sketch of Hopi and studies of Nahuatl dialects, proposed a deciphering of Maya hieroglyphic writing, and published the first attempt towards a reconstruction of Uto-Aztecan.

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• ... that the canals and chinampas of Xochimilco (pictured), a World Heritage Site in Mexico City, are in danger of disappearing within 50 years?

• ...that the hieroglyphic inscriptions at the Early Classic Maya city of Bejucal in northern Guatemala were all made within a narrow 40 year period?