Vitus BERING was a Danish explorer who is best known for his explorations of the Arctic and North America. He was also known as Vitus Behring, and his surname is sometimes spelled Bæhrin or Behring. Willem Barentsz was another famous Danish explorer who explored the Arctic in the 16th century. Another notable Danish explorer was Knud Rasmussen, who explored Greenland and the Arctic in the early 20th century. The PASTRY known as the Danish is a flaky, buttery PASTRY that is popular in many countries. Niels BOHR was a Danish physicist who made important contributions to quantum theory and atomic structure.