Making the world better, one answer at a time. Deodorant was around in ancient times but modern day deodorant was invented in 1888 by an inventor in Philadelphia, Pennsylvania.
Behavioral observations are a key component of cognitive psychology. Behavioral observations give cognitive psychologists a means of testing and evaluating theories about behaviors and a means of testing any predictions about those behaviors.
Descriptive observation means that you do not wish to modify the activity in any way, you just want to register it such as it would take place without your presence. An activity can interest a researcher because all professions and all industrial production are essentially chains of activities.