| http://www.w3.org/ns/prov#value | - The apparatus of claim 1, wherein the housing is configured to be attached to an ear of the person, wherein a physiological sensor is an acoustical sensor oriented in a direction towards a tympanic membrane of the ear and is configured to detect acoustical energy emanating from the tympanic membrane, wherein an environmental sensor is an acoustical sensor and is oriented in a direction away from t
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