In the heart, as in the movies, 3D action beats the 2D
experience hands down.
In 3D, healthy hearts do their own version of the twist.
Rather than a simple pumping action, they circulate blood as if they were wringing
a towel. The bottom of the heart twists as it contracts in a counterclockwise
direction while the top twists clockwise. Scientists call this the left
ventricular twist—and it can be used as an indicator of heart health.