Do Humans Have Different Amounts of DNA Series’

What is this yale publication actually say.  Is it saying that humans have a different amount of DNA Series’ and what does that actually mean?  As the internet continues to grow more people are realizing that the truth is out there it’s just hidden, as it always has been.  Facts can be proven and this is one of them.  This youtube article, while having a relatively low views, seems to have a lot of truth to it.  No one is disputing it.