How did the major scientific advances of the 20th century to change the contemporary world?

During the 20th century many advances were made, our world wouldn't be the same today without these scientists

Scientists of the Modern World:

Albert Einstein: Theory of Relativity

Enrico Fermi: atomic weapons

Marie Curie: radiation

Henry Ford: mass-produced automobiles

Wright Brothers: aviation

Jonas Salk: polio vaccine

George Washington Carver: agricultural techniques

Charles Drew: blood banks

Sigmund Freud: developmental psychoanalysis

Thomas Edison: light bulb

Watson and Crick: DNA structure

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.

answer; mechanics;