A kayak is a small, narrow watercraft, propelled by means of a double-bladed paddle. The word kayak originates from the Greenlandic word qajaq; the traditional kayak has one or more cockpits, each seating one paddler. The cockpit is sometimes covered by a spray deck that prevents the entry of water from waves or spray, differentiating the craft from a canoe; the spray deck makes it possible for suitably skilled kayakers to roll the kayak: that is, to capsize and right it without it filling with water or ejecting the paddler. Some modern boats vary from a traditional design but still claim the title "kayak", for instance in eliminating the cockpit by seating the paddler on top of the boat. Kayaks are being sailed, as well as propelled by means of small electric motors, by outboard gas engines; the kayak was first used by the indigenous Aleut, Inuit and Ainu hunters in subarctic regions of the world. Kayaks were developed by the Inuit, Yup'ik, Aleut, they used the boats to hunt on inland lakes and coastal waters of the Arctic Ocean, North Atlantic, Bering Sea and North Pacific oceans.

These first kayaks were constructed from stitched seal or other animal skins stretched over a wood or whalebone-skeleton frame.. Kayaks are believed to be at least 4,000 years old; the oldest existing kayaks are exhibited in the North America department of the State Museum of Ethnology in Munich, with the oldest dating from 1577. Native people made many types of boats for different purposes; the Aleut baidarka was made in double or triple cockpit designs, for hunting and transporting passengers or goods. An umiak is a large open sea canoe, ranging from 17 to 30 feet, made with wood, it is considered a kayak although it was paddled with single-bladed paddles, had more than one paddler. Native builders designed and built their boats based on their own experience and that of the generations before them, passed on through oral tradition; the word "kayak" means "man's boat" or "hunter's boat", native kayaks were a personal craft, each built by the man who used it—with assistance from his wife, who sewed the skins—and fitting his size for maximum maneuverability.

The paddler wore a tuilik, a garment, stretched over the rim of the kayak coaming, sealed with drawstrings at the coaming and hood edges. This enabled the "eskimo roll" and rescue to become the preferred methods of recovery after capsizing as few Inuit could swim. Instead of a tuilik, most traditional kayakers today use a spray deck made of waterproof synthetic material stretchy enough to fit around the cockpit rim and body of the kayaker, which can be released from the cockpit to permit easy exit. Inuit kayak builders had specific measurements for their boats; the length was three times the span of his outstretched arms. The width at the cockpit was the width of the builder's hips plus two fists; the typical depth was his fist plus the outstretched thumb. Thus typical dimensions were about 17 feet long by 20–22 inches wide by 7 inches deep; this measurement system confounded early European explorers who tried to duplicate the kayak, because each kayak was a little different. Traditional kayaks encompass three types: Baidarkas, from the Bering sea & Aleutian islands, the oldest design, whose rounded shape and numerous chines give them an Blimp-like appearance.

Most of the Aleut people in the Aleutian Islands eastward to Greenland Inuit relied on the kayak for hunting a variety of prey—primarily seals, though whales and caribou were important in some areas. Skin-on-frame kayaks are still being used for hunting by Inuit people in Greenland, because the smooth and flexible skin glides silently through the waves. In other parts of the world home builders are continuing the tradition of skin on frame kayaks with modern skins of canvas or synthetic fabric, such as sc. ballistic nylon. Contemporary traditional-style kayaks trace their origins to the native boats of Alaska, northern Canada, Southwest Greenland. Wooden kayaks and fabric kayaks on wooden frames dominated the market up until the 1950s, when fiberglass boats were first introduced in the US, inflatable rubberized fabric boats were first introduced in Europe. Rotomolded plastic kayaks first appeared in 1973, most kayaks today are made from roto-molded polyethylene resins; the development of plastic and rubberized inflatable kayaks arguably initiated the development of freestyle kayaking as we see it today, since these boats could be made smaller and more resilient than fiberglass boats.

Kayak design is a matter of trade-offs: directional stability vs maneuverability. Multihull kayaks face a different set of trade-offs; the paddler's body sha

French submarine Papin

Papin was one of 18 Pluviôse-class submarines built for the French Navy in the first decade of the 20th century. List of submarines of France Couhat, Jean Labayle. French Warships of World War I. London: Ian Allan. ISBN 0-7110-0445-5. Gardiner, Robert & Gray, Randal. Conway's All The World's Fighting Ships 1906–1921. London: Conway Maritime Press. ISBN 0-85177-245-5. Garier, Gérard. A l'épreuve de la Grande Guerre. L'odyssée technique et humaine du sous-marin en France. 3–2. Bourg-en-Bresse, France: Marines édition. ISBN 2-909675-81-5. Garier, Gérard. Des Émeraude au Charles Brun. L'odyssée technique et humaine du sous-marin en France. 2. Bourg-en-Bresse, France: Marines édition. ISBN 2-909675-34-3

1893: A World's Fair Mystery

1893: A World's Fair Mystery is an educational work of interactive fiction by American author Peter Nepstad, written in the TADS programming language. It takes place during the Chicago World's Columbian Exposition of 1893; the exposition is recreated in detail, with archival photographs from the fair and in-depth descriptions detailing each of the few hundred locations. An early text-only version won the 2002 XYZZY Award for Best Setting, 1893 was declared runner-up for Games' Best RPG/Adventure 2004. During the 1893 World's Colombian Exposition, eight diamonds have been stolen from the exhibition pavilion of the fictional Kimberly Diamond Mining Company; the player assumes the role of a detective. The theft soon develops into a kidnapping case, the player has to investigate a murder. Official page 1893: A World's Fair Mystery at MobyGames 1893: A World's Fair Mystery Download page at the Interactive Fiction Database