11.   But, Atema admits, many animals also produce sounds in ways that, to human ears, meet virtually any definition of music.

12.   Elephants have a vast repertoire of vocalizations, some too low for the human ear to detect.

13.   For instance, anyone who claims to have found a human ear in their pasta primavera will automatically be excluded from the contest, unless they include photographic evidence.

14.   For example, the tight waves of ultrasound are focused enough to use in medicine, but they cannot be heard by human ears.

15.   If there is any point of Democratic orthodoxy that the vice president has sought to overturn, his protest has been inaudible to the human ear.

16.   In fact, said Dr. Robbins, many of its noises are above the range audible to the human ear.

17.   One question is how much the filtering has to match that of a human ear in order to maintain the illusion.

18.   Payne concluded that the animals may have been communicating at frequencies far below the detection of human ears.

19.   Sound waves picked up by the microphones are analyzed by a computing device in a way similar to how the human ear processes sound.

20.   The computer, though, found faults and fissures undetected by the human ear.