Physiological Ability
Not all humans are able to wink voluntarily, and some can only wink one (usually the non-dominant) eye. Others are far better at winking one eye and find it awkward to wink the other.
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Famous quotes containing the word ability:
“Twentieth-century art may start with nothing, but it flourishes by virtue of its belief in itself, in the possibility of control over what seems essentially uncontrollable, in the coherence of the inchoate, and in its ability to create its own values.”
—A. Alvarez (b. 1929)