The pH scale is a scale that is used to represent the level of acidity in a solution. A solution with a pH of 7 is neutral, while a solution with a pH below 7 is an acid, and a solution with a pH above 7 is a base. An acid dissociates, or breaks apart, and donates protons, or hydrogen ions, in an aqueous solution, while a base donates hydroxide ions in a solution. Water, for example, is neutral with a pH of 7. When acids are added, they release more hydrogen ions into the solution, and this causes the pH of the solution to drop.
Two days later, EA CEO John Riccitiello stated that Spore would be released sometime before the holidays. On February 12, 2008, Electronic Arts announced in an official press release that the official release date would be September 5, 2008 for Europe and September 7, 2008 for North America.
Alexander Fleming, a British scientist, noticed in 1928 that mould had prevented the growth of bacteria in his lab. But the main plot of the story involves the rediscovery of penicillin 10 years later by an Australian scientist born one hundred years ago this year. Howard Florey and his dedicated team's systematic, detailed work transformed penicillin from an interesting observation into a life saver.