Earbuds; earphones; sensors for scientific use to gather human biometric data; sensors for scientific use to gather human physiological data, namely, brain signals, eye movement, muscle movement, dermal movement, head movement, blood pressure, heart rate, respiratory rate, and sounds from inner body such as speech, breathing sounds, and organ sounds; sensors for scientific use to gather human movement data, namely, movement of the eyes, skin, head and body while sleeping or during activity; sensors for scientific use to gather human eye movement data; sensors for scientific use to gather human head movement data; sensors for scientific use to gather human location data; wearable ear, head, eye, and wrist monitors used to measure human biometric data for scientific use; downloadable software for use with earbuds and earphones for gathering human biometric data; downloadable software for use with sensors to gather human biometric data; downloadable software for wearable ear, head, eye, and wrist monitors for gathering human biometric data; downloadable software for use with neurological therapy apparatus, light therapy apparatus, and sleep therapy apparatus for gathering human biometric data; earbuds for human-computer interaction