The noted 15th and 16th century maritime explorers Ferdinand Magellan, Pedro Álvares Cabral, Vasco da Gama and Bartolomeu Dias (or Bartholomew Diaz) are all of what nationality?
Which Greek mathematician, from the 1st century BC, is best known for the theorem which bears his name and for leading a group who discovered square numbers and proposed that the earth was round, planets have an axis, and they travel around the sun?
