Neutral buoyancy diver maintains neutral buoyancy by continuous correction, usually by controlled breathing, as neutral buoyancy is an unstable condition for a compressible object in a liquid. The mathematician Archimedes discovered much of how buoyancy works more than 2000 years ago. In his research, Archimedes discovered that an object is buoyed up by a force equal to the weight of the water displaced by the object. In other words, an inflatable boat that displaces 100 pounds (45 kilograms) of water is buoyed up by that same weight of support. An object that floats in the water is known as being "positively" buoyant.
The Legend of Zelda: A Link to the Past and Four Swords 2002 by series developer Shigeru Miyamoto, who demonstrated the multi-player mode along with Capcom's Yoshiki Okamoto, Namco Bandai's (formerly Namco) Kaneto Shiozawa, and Toshihiro Nagoshi of the now defunct Amusement Vision. It was tentatively titled "The Legend of Zelda GBA". In January 2003, the game was on display at the Osaka World Hobby Convention as "The Legend of Zelda: A Link to the Past & Four Swords". It was initially released in North America on December 2, 2002, while it was released the next year in Japan and PAL regions, on March 14 and 28 respectively. Shigeru Miyamoto made a