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Sail is one of the major human inventions. It allowed ships to move faster and not to depend on oars and power of human hands. Sails were invented some 7000 years go and are still in use. Read more about history of sailing and sails.
Vikings were skillful shipbuilders and excellent navigators. Their ships are considered one of the greatest technical and artistic achievements of their times. Some Viking ships even lasted to this day.
Since the earliest desire to cross the seas, people built passenger ships which helped them in that. Ship grew bigger in time and today and today we have cities on water that can circumnavigate the globe. Check out timeline of ships.
Research ships are a special type of sea vessels that are equipped with laboratories and materials that allow for different kinds of scientific research. The first one appeared in 18th century but we still have them today. Read more about history of research ships.