There are many reasons why discipline can be a problem in your classroom. One of the reasons could be your teaching style. If you aren't reaching every one of your students, they can become bored, disinterested and restless. As mentioned in the section on instruction, every student has their own learning style and an area where they excel.
D.O stands for Doctor of Osteopathic medicine. Dr. Still developed osteopathic medicine in 1874. He believed that every illness has a cause and every cause has a location. You find the location to make one healthy.
When addressing several people, each of whom holds a doctoral title, one may use the plural abbreviation Drs (or Drs.in American English) for example, instead of Dr Vinod and Dr Harsh: Drs Vinod and Harsh. The abbreviation Drs. can also mean doctorandus, a Dutch academic title.