Spiral is one of the most common shapes in nature, and it is used in DNA and many other micro structures found in biological cells. Why, however, is nature so partial to this structure? Physicists in Pennsylvania believe they have found the mathematical answer to this question. Their findings were published in a recent issue of science.

Spiral is a kind of twisted curve like spiral and screw. It is a common shape in biology. For example, it can be found in DNA and many proteins. The helix is divided into left-handed and right-handed.

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