While home insulation remains one of its most common applications, the name itself has become a generic term for any material containing thin fibers of glass formed into a woven layer or used as reinforcement. The glass in fiberglass is the same basic substance used in windows and glassware. Molten glass is extruded through ultra fine openings measured in microns, resulting in thread-like formations which can be woven together to form a rough cloth or patch.
The answer is 100. We assume you are converting between decade and millennium. You can view more details on each measurement unit: decade or millennium. The SI base unit for time is the second. 1 second is equal to 3.17097919838E-9 decade, or 3.17097919838E-11 millennium. Note that rounding errors may occur, so always check the results.
The reason why the 3rd Millennium, also known as the 21st Century, starts in 2001 is because there was no year 0, i.e., there was no year AD 0, nor was there a year 0 BC. The year before the year AD 1 is defined as the year 1 BC, so the year 0 was skipped.