If a professor had the persistent, disturbing, intrusive notions that there were germs lurking everywhere, on papers students handed in, on books checked out of the library, on the chalk left by the previous teacher, the professor would be experiencing

obsessive ideas

Explanation:

Obsessive ideas are characterized by uncontrolled thoughts of distressing thoughts and images which are usually accompanied by uneasy feeling and behavioral routines that seem reoccurring. The professor might start getting scared of falling ill or worry over little things such as papers that may contain germs. He may also indulge in compulsive behaviors that are obsessive, such as frequent washing of the hands.

    racial conflict and discrimination has existed ever since man learned to kill with rocks and bones. these conflicts arose from disputes between territory, power, wealth, religion, or simple difference. some of the most infamous racial disputes include slavery, the holocaust, and the civil rights movement.

    these listed disputes often resulted in casualties from all sides. riots, wars, imprisonment, and lynching are all commonly associated with racial conflict on severe levels.

      however, racism is an improving issue in recent decades. people are being more accepting and welcoming of diverse populations. though, the world isn't perfect and it will take much more time, if ever, until the world is rid of racism.

c. wright mills's sociological imagination suggest investigating to explain this increase?