who is the Italian explorer that traveled to the Caribbean on three occasions but was never convinced that he had discovered a new world.

Answer 1

what was the document posted to the door of the University of Wittenberg by Marin Luther, that challenged the beliefs of the catholic church.

Answer 2

Let us know what you decide, once you've scanned through the following linked articles:

http://www.google.com/search?q=italian+explorer&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GGIE_en

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Martin Luther - Wikipedia, the free encyclopedia Martin Luther (1483 – 1546) initiated Protestantism, one of the major movements within Christianity. He was a German monk, theologian, university professor, ...
http://en.wikipedia.org/wiki/Martin_Luther

Reformation: Martin Luther The sixth chapter of the learning module, Discovery and Reformation. This chapter outlines the life and the main thought of Martin Luther, ...
http://wsu.edu/~dee/REFORM/LUTHER.HTM

CATHOLIC ENCYCLOPEDIA: Martin Luther Leader of the great religious revolt of the sixteenth century in Germany; born at Eisleben, 10 November, 1483; died at Eisleben, 18 February, 1546.
http://www.newadvent.org/cathen/09438b.htm