He's been in their lives for over 10 years. But it goes on, and it will evolve.â. Indeed, Grey's has persevered after the departures of several regular cast members, including Isaiah Washington, Sandra Oh, Katherine Heigl, T.R. Knight, Kate Walsh, Eric Dane, Chyler Leigh, and Kim Raver.
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.
A study from Microsoft involving more than 2,000 people has found that the average attention span has dipped to a low 8 seconds â down from 12 seconds in 2000. A goldfish has an attention span of 9 seconds. There are many effects from smartphones and the like on the human body which are never written about.