Mollusks maintain the symmetry of their pearls by adjusting the thickness of each layer of shimmering nacre. If one layer of the pearl’s nacre is thinner, the next layer is thicker and will balance ...

Epstein pearls are small, white bumps that form in a baby’s mouth before they're born. Learn more about them, including how they're diagnosed and treated. Medically reviewed by Wendy L. Hunter, M.D.

Pearl oysters are an important animal for farming in Japan as they produce the beautiful pearls, which are of economic value. But, in the last 20 years, a combination of different factors, such as ...