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.
(An observational study measures the value of response variable without attempting to influence any of the response or explanatory variables of the individual). That is, in an observational study, the researcher observes the behavior of the individuals in the study without trying to influence the outcome of the study.