Most of the axons in the central nervous system are wrapped in myelin, a substance rich in lipids (fatty substances) and proteins. Like the coating around an electrical wire, myelin insulates and protects the axon and helps speed nerve transmission.
Potato/Semi Round Pearls. Potato pearls are some of the less expensive freshwater pearls to be found on the market, but their look is anything but cheap. You can purchase potato pearls in every color of the rainbow, and craft beautiful one of a kind creations for gifts and your own collection.
What parents need to know. The Pearl is based on a Mexican folk tale that the author first heard around 1940. Though it creates a well-formed, fictional world of poor pearl divers living on corncakes and beans in brush huts in Baja, California, it is foremost meant as a parable for human nature, for good or bad.