Famous quotes containing the words scientific and/or theories:
“Superstition? Who can define the boundary line between the superstition of yesterday and the scientific fact of tomorrow?”
—Garrett Fort (1900–1945)
“It takes twenty or so years before a mother can know with any certainty how effective her theories have been—and even then there are surprises. The daily newspapers raise the most frightening questions of all for a mother of sons: Could my once sweet babes ever become violent men? Are my sons really who I think they are?”
—Mary Kay Blakely (20th century)