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.
Definition of observation for English Language Learners. : 1  a statement about something you have noticed : a comment or remark. : 2  the act of careful watching and listening : the activity of paying close attention to someone or something in order to get information. : 3  something you notice by watching and listening.