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In page Shu Chien:

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In 1967 Chien published three papers in Science that advanced the understanding of the physics behind the flow of red blood cells.[1][2] Chien and his colleagues were able to explore the flow properties of red blood cells through various experiments involved with filtering red blood cells through plastic porous sieves. One key finding was that the flow of red blood cells does not follow Newtonian behavior and this characteristic is fundamental in aiding red blood cells to squeeze through capillaries.