Technology: general issues 148 History of engineering and technology 125 Research & information: general 85 human 77 Humans 61 article 58 Article 55 controlled study 52 male 52 female 50 Millimeter waves 40 History of engineering & technology 38 Physics 36 adult 36 Wave propagation 35 Female 33 Male 32 Shock waves 30 Research and information: general 29 Acoustic wave propagation 27 Dispersion (waves) 27 ultrasound 26 Shear flow 25 Radio waves 24 Shear waves 24 physiology 24 Numerical methods 22 Ultrasonic waves 22 Stars 21 Surface waves 21