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 perspective similar to that of the original "The Legend of Zelda", dropping the side scrolling elements of "". "The Legend of Zelda: A Link to the Past" introduced elements to the series that are still commonplace today, such as the concept of an alternate or parallel world, the Master Sword and other new weapons and items. Critics and players alike have commented on the similarities between "A Link to the Past" and the Nintendo 64 sequel "Ocarina of Time", with some even referring to the latter as a "spiritual remake" of "A Link to the Past". Released to critical and