Here's a great video that Google did back in 2009 that illustrates this pretty well: https://www.youtube.com/watch?v=o4MwTvtyrUQ https://www.youtube.com/watch?v

Here's a great video that Google did back in 2009 that illustrates this pretty well: https://www.youtube.com/watch?v=o4MwTvtyrUQ https://www.youtube.com/watch?v=o4MwTvtyrUQ