1) in japanese, why can't you use "shinin" for four people?

2) why can't you use "kusai" for nine years old?

yo : 3

Monroe just left his second job in the marketing, sales, and service career pathway. he was self-employed at his first job, and worked for a nonprofit for his second job. he recently took another job in logistics and distribution.

Psychology is the study of the mind, biology is the study of living organisms, and archeology is the study of human history. based on this information, what does the suffix -logy most likely mean?

Safe opening of box without an exposed blade