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  • Irish Chronicles Document Links Between Volcanoes and Weather
    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong corr...Read more

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    Irish Chronicles Document Links Between Volcanoes and Weather

    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
  • EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US
    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, acco...Read more

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    EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US

    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, according to the National Weather Service in Norman Oklahoma. The tornado, which remained on the ground for 40 minutes and reached 2.6 miles across (4.2 km), took the lives of 18 people including storm chasers Tim Samaras, Paul Samaras and Carl Young. For more information on the tornado, visit http://ow.ly/i/2hfDG.
  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
Sketch based on a drawing from the Florentine Codex, a sixteenth-century colonial manuscript compiled by Fray Bernardino de Sahagun.
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Huitzilopochtli

Huitzilopochtli, whose name means "Blue Hummingbird on the Left," was the Aztec god of the Sun and the war. He was shown as a blue man fully armed with hummingbird feathers on his head. His mother Coatlicue became pregnant with Huitzilopochtli when a ball of feathers fell from the heaven and touched her. Huitzilopochtli's siblings thought that their mother Coatlicue had dishonored them with her mysterious pregnancy.

One sister of Huitzilopochtli, Coyolxauhqui, encouraged her star sisters and brothers to kill their mother Coatlicue. However, Huitzilopochtli sprang out of his mother and saved her. Coatlicue regretted such violence. Thus, Huitzilopochtli cut off Coyolxauhqui's head and threw it in the sky to become the Moon.

Aztecs used to offer human sacrifices to Huitzilopochtli. The victims were usually prisoners captured in the frequent wars that Aztecs were fighting against their neighbors. The sacrifices were intended to secure rain, harvests and success in war.The most common form of sacrifice practiced by Aztecs was to tear out the heart of a living body and offer it to the Sun.

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