A compound interest calculator is used for determining how much your invested money can make you in it's lifetime of being invested. This is useful in telling you how much a certain amount of money will make you when it matures.
Some people make no money at all being a vertebrate paleontologist, while others make a decent living. The one thing that is pretty certain is that you won't get rich being a paleontologist. Most people do paleontology because they really enjoy it, rather than to make a lot of money.