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A great hammerhead shark’s two eyes can be 3 feet apart on opposite sides of its skull. Ken Kiefer 2/Image Source via Getty Images

Why do hammerhead sharks have hammer-shaped heads?

The first hammerhead shark was likely the result of a genetic deformity. A biologist explains how shark DNA reveals hammerheads’ history.
Osteoarthritis of the knee is not only associated with aging. It can also be caused by different stresses on the cartilage, such as a knee injury or a strenuous job. (Shutterstock)

The 3D technology that could revolutionize the treatment of osteoarthritis of the knee

A technology that measures three-dimensional movement of the knee in real-time enables health professionals to make better assessments of the joint.

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