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.
Most word processors and text editors allow you to choose between two modes: overwrite and insert. In overwrite mode, every character you type is displayed at the cursor position. If a character is already at that position, it is replaced. In insert mode, each character you type is inserted at the cursor position. This means that existing characters are moved over to make room for the new character, but they are not replaced. Overwrite mode is sometimes called overtype mode.