Two is the principal square root of 4. Both −2 and +2 are square roots of 4.

When the colonel has given the signal for the music to beat time, he will give the caution for the movement as above; and the lieutenant colonel will immediately give the word to the right wing to mark time.

Talk about focussing on the unimportant. Give your head a shake, Google.

The house whirled around two or three times and rose slowly through the air. Dorothy felt as if she were going up in a balloon.