True allergies to cow's milk are relatively uncommon. Only 2 to 3 percent of children are allergic to milk, according to the AAP, and almost all of them outgrow it by age 3. (Learn the difference between a milk allergy and lactose intolerance .).
The underscore [ _ ] (also called underline, underbar, low line, or low dash) is a character that originally appeared on the typewriter and was primarily used to underline words.
This reminds me of one of my pet peeves: all these unneeded special characters in the text mode. If you use the underscore package, then you don't need to escape the _ in text mode. FWIW, in ConTeXt, _ has a letter catcode in text mode, so simply typing Samp_Distt_Corr works. â Aditya Mar 20 '12 at 3:17.