Do you have to have a really fast shutter to stop the motion?
No, the shutter is open for 1/60th of a second (a drop could fall three inches in this amount of time.) The key is the flash unit: it needs to generate a very bright burst of light for a very short amount of time (about 1/10,000 of a second). This is central to high-speed photography.
Source: The Liquid Sculpture FAQ
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