ASUS Battery Information Center. The battery pack's service life will depend on the environment temperature, humidity, and notebook PC usage. The battery capacity usage versus cycle performance attenuation follows a linear type curve. Lithium-ion (Li-ion) batteries typically have a lifespan of between 300 and 500 cycles.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing.
Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood disorders and can continue through adolescence and adulthood.Symptoms include difficulty staying focused and paying attention, difficulty controlling behavior, and hyperactivity (over-activity).DHD is one of the most common childhood disorders and can continue through adolescence and into adulthood. The average age of onset is 7 years old. ADHD affects about 4.1% American adults age 18 years and older in a given year.