| http://www.w3.org/ns/prov#value | - Shorter wavelengths are ultrasound, which are probably most familiar for tracking the health of fetuses: these sound waves can penetrate or reflect off tissue, and by measuring the waves that bounce back, doctors can track blood flow and other developmental processes inside your body. (X-rays go right through soft tissues, so they???re better for looking at bones.) Longer wavelengths are infrasoun
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