The National Research Council (2002) associates the indicators of self-management (self-control, perseverance, stress management and goal-setting) with personal and social assets that facilitate positive youth development in the area of psychological and emotional development.
A Petabyte is approximately 1,000 Terabytes or one million Gigabytes. It's hard to visualize what a Petabyte could hold. 1 Petabyte could hold approximately 20 million 4-door filing cabinets full of text. It could hold 500 billion pages of standard printed text.
There are 1024 gigabytes in a terabyte. And 1024 terabytes in a petabyte. So there are 10242 or 1 048 676 gigabytes in 1 petabyte. Interesting side note: It is said that google processes 20 petabytes of data every day.