Why is the industrail revolution a game changer in world history

Which is the best example of a primary source ducument useful in the study of history ?

For your research paper on the history of maui, you locate a source covering the overall history of the hawaiian islands. as you evaluate the source, however, you decide not to use it in your research because it never mentions maui. this significant omission of information falls under what criterion for evaluating resources?

Who was marshall mcluhan and what did he have to do with communication theory?