Add Yahoo as a preferred source to see more of our stories on Google. Epstein pearls are small, white bumps that form in a baby’s mouth before they're born. Learn more about them, including how ...

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 ...

Pearls form as a natural defense mechanism when oysters trap irritants inside their shells and coat them with layers of nacre. While natural pearls are rare, cultured pearls are carefully farmed using ...