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Scientists use a special machine called a rheometer, to measure fluids as they are twisted between two flat plates.

The scientists spun the solution slowly in a rheometer, a device that measures viscosity, and recorded how the sample flowed at different spin rates and bacterial concentrations.

Among the first in order of time—and still retaining no unworthy position in order of merit—is the "rheometer," or "flow-measurer," of M. Giroud.

They attached Oreos to a rheometer and began a series of carefully controlled twisting experiments.

Ms. Owens wanted to see if you could use a rheometer to open an Oreo so that each side of the opened cookie would have cream on it.