Dark circles under the eyes are a common complaint of both men and women, although they can occasionally be seen in children. As people age, the skin becomes thinner and collagen is lost, sometimes enhancing the appearance of blood vessels beneath the eyes and making the area appear darker.
A bond is an interest-bearing security that obligates the issuer to pay the bondholder a specified sum of money, usually at specific intervals (known as a coupon), and to repay the principal amount of the loan at maturity. Zero-coupon bonds pay both the imputed interest and the principal at maturity.
For example, an individual bond will pay interest, called a coupon, to the bond holder (investor) at a stated rate for a stated period of time (term). If held to maturity, and the bond issuer does not default, the bond holder will receive all interest payments and 100% of their principal back by the end of the term.