…consider that just about every baby born in the United States learns to speak English. …Growing up in a culture that surrounds you with exposure to English makes it natural to learn English… This is directly analogous to prevention [of disease], which requires you “grow up in it,” but is easy and painless, as compared to dealing later on with what you didn’t learn early. That’s costly, hard, and painful.
Dr. David Katz
from his Huffpost article, “Plain English About Ounces, Pounds, Dollars and Sense”