The structure of the growth lines in the shell of the red abalone, Haliotis rufescens, has been characterized by X-ray diffraction analysis and by scanning and transmission electron microscopy. The ...

See how you can make a coastal-inspired jewelry holder, which doubles as decor, with beach shells.

The tortoise shell-esque pattern frames the birds and continues up the blade. A diagram shows the 1,300-year-old sheath (left) and the spear blade inside (right).

The structural differences between turtles and tortoises are noticeable when you look at their shells and limbs. Turtles typically have flat, streamlined shells that aid in swimming, whereas tortoises ...