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Psittacosaurus

Psittacosaurus is a genus of psittacosaurid ceratopsian dinosaur from the Early Cretaceous Period of what is now Asia, about 130 to 100 million years ago. It is notable for being the most species-rich dinosaur genus. Nine to eleven species are recognized from fossils found in different regions of modern-day China, Mongolia and Russia, with a possible additional species from Thailand. All species of Psittacosaurus were gazelle-sized bipedal herbivores characterized by a high, powerful beak on the upper jaw. At least one species had long, quill-like structures on its tail and lower back, possibly serving a display function. Psittacosaurus is not as familiar to the general public as its distant relative Triceratops but it is one of the most completely known dinosaur genera. Fossils of over 400 individuals have been collected so far, including many complete skeletons. Most different age classes are represented, from hatchling through to adult, which has allowed several detailed studies of Psittacosaurus growth rates and reproductive biology. The abundance of this dinosaur in the fossil record has led to establishing the Psittacosaurus biochron for the Early Cretaceous of east Asia. (Full article...)

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Did you know...

From Wikipedia's newest content:

Sweetbriar Hall, Nantwich

  • ... that scientist Joseph Priestley is believed to have lived at Sweetbriar Hall (pictured), in Nantwich, Cheshire, and another scientist, Sir William Bowman, was born there?
  • ... that Nyarroh, a female chief of the Barri region of Sierra Leone, hosted multiple negotiations between the British and Mende tribes in the 1880s and 1890s?
  • ... that about half of the blood donations in Bangladesh are one-time donations for specific patients?
  • ... that Henry Clay and Daniel Webster addressed crowds from the Orators Mound in Ohio?
  • ... that Sali Aga was nicknamed Rudnik Bull because of the mass rape events that he organized for himself and his men?
  • ... that the upcoming video game Godus is the spiritual successor to Peter Molyneux's Populous?
  • ... that the relative distance of Maskanah, a town in northern Syria, to the Euphrates has varied over the years due to changes in the river's bed?
  • In the news

    Wegelin & Co. headquarters
  • Switzerland's oldest bank, Wegelin & Co. (headquarters pictured), announces it will close after being fined by U.S. authorities for enabling tax evasion.
  • In chess, Magnus Carlsen achieves the highest FIDE rating of all time.
  • At least 60 people are killed and 200 injured in a stampede after celebrations at Félix Houphouët-Boigny Stadium in Abidjan, Ivory Coast.
  • Argentina, Australia, Luxembourg, Rwanda, and South Korea join the United Nations Security Council.
  • China officially opens the world's longest high-speed rail route, linking Beijing and Guangzhou.
  • Egyptian voters approve a new constitution.

    Recent deaths: Rita Levi-Montalcini

  • On this day...

    January 7: Christmas (Julian calendar); Victory Day in Cambodia; Flag Day in Italy

    Francis, Duke of Guise

  • 1558Francis, Duke of Guise (pictured), retook Calais, England's last continental possession, for France.
  • 1785 – Frenchman Jean-Pierre Blanchard and American John Jeffries became the first to cross the English Channel by air, in a balloon.
  • 1948Air National Guard pilot Thomas Mantell fatally crashed his P-51 Mustang while in pursuit of a UFO near Fort Knox, Kentucky.
  • 1993 – The Fourth Republic of Ghana was inaugurated with Jerry Rawlings as its president.
  • 2007 – Newly appointed Archbishop of Warsaw Stanisław Wielgus resigned amid allegations that he collaborated with the Polish communist government's secret police.

    More anniversaries: January 6 January 7 January 8

    It is now January 7, 2013 (UTC) – Refresh this page
  • A man in red overalls, with his left hand at the rear of his head.

    Forty-nine drivers have suffered fatal accidents while driving Formula One cars since the creation of the Formula One World Championship in 1950. Thirty-two of the drivers died during World Championship Grand Prix race weekends, six during test sessions and eleven during non-championship Formula One events. The Indianapolis Motor Speedway has seen the most fatalities; seven drivers have died there during the course of the Indianapolis 500. Fifteen drivers died in the 1950s; fourteen in the 1960s; twelve in the 1970s; four in the 1980s and two in the 1990s. No driver has suffered a fatal accident since 1994, making this the longest period in F1 history without a driver fatality. Only two Formula One Champions have died while racing or practicing in Formula One, Jochen Rindt in 1970, and Ayrton Senna (pictured) in 1994. Rindt is the only driver to win the championship posthumously. (Full list...)

    Frecce Tricolori

    The Frecce Tricolori is the aerobatic demonstration team of the Italian Aeronautica Militare, based at Rivolto Air Force Base, in the Friuli Venezia Giulia region, province of Udine. They were formed in 1961 as an Air Force team, replacing unofficial teams that had been sponsored by various commands by the end of the 1920s.

    Photo: Łukasz Golowanow

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