<P> In 1995, the Mexican chemist Mario J. Molina shared the Nobel Prize in Chemistry with Paul J. Crutzen and F. Sherwood Rowland for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone . Molina, an alumnus of UNAM, became the first Mexican citizen to win the Nobel Prize in science . </P> <P> In recent years, the largest scientific project being developed in Mexico was the construction of the Large Millimeter Telescope (Gran Telescopio Milimétrico, GMT), the world's largest and most sensitive single - aperture telescope in its frequency range . It was designed to observe regions of space obscured by stellar dust . </P> <P> Mexico has traditionally been among the most visited countries in the world according to the World Tourism Organization and it is the most visited country in the Americas after the United States . The most notable attractions are the Mesoamerican ruins, cultural festivals, colonial cities, nature reserves and the beach resorts . The nation's wide range of climates, from temperate to tropical, and unique culture--a fusion of the European and the Mesoamerican--make Mexico an attractive destination . The peak tourism seasons in the country are during December and the mid-Summer, with brief surges during the week before Easter and Spring break, when many of the beach resort sites become popular destinations for college students from the United States . </P> <P> As of 2016, Mexico was the 8th most visited country in the world and had the 14th highest income from tourism in the world which is also the highest in Latin America . The vast majority of tourists come to Mexico from the United States and Canada followed by Europe and Asia . A smaller number also come from other Latin American countries . In the 2017 Travel and Tourism Competitiveness Report, Mexico was ranked 22nd in the world, which was 3rd in the Americas . </P>

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