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Macrobdella decora , the North American medicinal leech, is a species of freshwater leech found in Canada, the United States, and Mexico. A medium-sized annelid growing up to 8.5 cm (3.3 in) long, it has a spotted greenish-brown back and a reddish underbelly. M. decora is commonly encountered by swimmers and lives in ponds, ditches, and wetlands. The leeches are both blood-sucking parasites and aggressive predators. They have three saw-like "jaws" which they use to penetrate their host's skin, and they can remain attached for up to two hours. Their hosts include fish, turtles, wading birds, and mammals, including humans. The leeches are also voracious predators who eat other invertebrates, amphibian eggs and larvae, and sometimes even members of their own species. M. decora was historically used for leeching by European colonists in North America, who found the native leeches "equally efficacious" as those from Europe. (Full article... )

Edmund Ætheling (born 1016 or 1017, died before 1057) was a son of Edmund Ironside and his wife Ealdgyth. Edmund Ironside briefly ruled as king of England following the death of his father Æthelred the Unready in April 1016. Edmund Ironside died in late 1016 after a hard-fought war with Danish invader Cnut who became king of all England shortly after. The following year, Cnut sent Edmund Ironside's two infant sons, Edmund Ætheling and Edward the Exile, to Continental Europe, probably to the King of Sweden, to be murdered. Instead, the princes were spared and sent to Hungary, possibly after a sojourn at the court of Yaroslav I, prince of Kiev, in Russia. As Ironside's marriage lasted no more than 15 months, Edmund and Edward were either twins or one was born after their father's death. Edmund may have married a daughter of the Hungarian king, and he died in Hungary on 10 January in an unknown year before 1057. (Full article... )

George Mason (December 11, 1725 – October 7, 1792) was a Founding Father of the United States. A delegate to the Constitutional Convention of 1787, he was one of three delegates who refused to sign the Constitution. His writings have exercised a significant influence on American political thought and events. The Virginia Declaration of Rights, which Mason principally authored, served as a basis for the United States Bill of Rights, of which he has been deemed a father. Many clauses in the Constitution were influenced by Mason's input, but he ultimately did not sign, citing the lack of a bill of rights. His prominent fight for a bill of rights led fellow Virginian James Madison to introduce one during the First Congress in 1789; these amendments were ratified in 1791, a year before Mason died. Obscure after his death, Mason later came to be recognized in the 20th and 21st centuries for his contributions to Virginia and the early United States. (Full article... )