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A picture of a fetus (baby in the Mother's womb), aged 29 weeks, in a "3D ultrasound"

Ultrasound is a type of sound with a frequency higher than humans can hear. This frequency, the upper limit of human hearing, is approximately 20,000 hertz (20 kilohertz). view more...

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This simple piece of plastic makes ultrasound easy

This simple piece of plastic makes ultrasound easy
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