The answer is: Expert
Expert testimony is a form of testimony that come from people who have deep knowledge and experience in a certain issue. This type of testimony usually regarded very highly in the court and has higher chance to convince the juries to a certain opinion.
(examples of expert testimony are: testimony regarding fake internet account from IT experts, testimony about violent behavior from psychologists, etc)
In the late 1800's, economic, political and religious motives prompted European nations to expand their rule over other regions with the goal to make the empire bigger. The Industrial Revolution of the 1800's created a need for natural resources to fuel the newly invented machinery and transportation.
It helped increase population. Before agriculture, people roamed around and
gathered what they could to survive.
Later on, they learned how to grow their plants and raise their own
livestock, they decided to settle down.
This led to the growth of communities and the start of civilization.
Radio, Television, Telephone, and jazz music are some of the things that profoundly transformed entertainment, education, commerce, and research in the 1920s
