Roman physician galen advanced the study of body structure called Mythology
Astronomy
Satire
Anatomy

Galen's understanding of anatomy and medicine was principally influenced by the then-current theory of humorism (also known as the theory of the four humors: black bile, yellow bile, blood, and phlegm), as advanced by ancient Greek physicians such as Hippocrates.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.