Sterling silver contains 92.5% silver. The rest is copper or some other metal. It is used for jewellery and silver tableware, where appearance is important. Silver is used to make mirrors, as it is the best reflector of visible light known, although it does tarnish with time.
There are three types of pancreatic tumors. Insulinoma: This is a rare type of pancreatic tumor that secretes insulin, which lowers the levels of sugar in the blood. Research indicates that only 10% of insulinomas are cancerous. Surgery is the only option for survival of insulinoma and 90% success rate is assured.
Carcinoid tumors are by far the most common type of neuroendocrine tumor found in the gastrointestinal system. Other, more rare types of gastrointestinal neuroendocrine tumors include small cell carcinoma, large cell carcinoma, and pancreatic neuroendocrine tumors, which arise in the islet cells of the pancreas.