This learn node provides arctic exploration history, especially of the heroic age from the 1840s through early 1900s. The learn node is in the form of a Google knol that is the work of Professor Russell Potter of Rhode Island College. Topics include Norsemen, early explorers Martin Frobisher, Henry Hudson, John Ross, William Edward Parry, and John Franklin, for whom a search when he did not return from an encampment with relics and graves. Descriptions of the explorations that followed in later years feature Elisha Kent Kane, Charles Francis Hall, Adolphus Washington Freely, Roald Amundsen, and the Robert Peary adventurers.
This fascinating Google knol can be called a learn node because it provides links to excellent related nodes that are webpages in the open internet. The knol thus forms a small cluster in which a great deal can be learned about arctic explanation and from which further internet exploration of the subject can be launched.