The headline is not acuratly representing the contents of the article. The full quote which is where the "once thought an impossible feat" part comes from: > T

The headline is not acuratly representing the contents of the article. The full quote which is where the "once thought an impossible feat" part comes from: > That makes D.W. different from other people who have demonstrated the ability to change their pupil size, Strauch told Live Science. What's more, that he can feel the muscles in the pupils directly "is astonishing, as it was thought to be impossible." What's new isn't controlling the pupils but to "feel the muscles directly". Not sure how that part is verified though.