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Amazon.com: Ultrasound Gel for Doppler Blue, Non-irritating, Moisturizing 250 ml - Ultrasound Gel for Cavitation, Baby Doppler, Massage Gel, EMS - Water Based Gel, Fragrance Free, Alcohol Free (2 x 250ml, 8.5
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Red-shift & Blue-shift Caused By Doppler Effect Photograph by David A. Hardy/science Photo Library - Fine Art America
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