It might not be information you want to know, but just in case you do, scientists have designed a noninvasive test called the "death test" which can tell people how long they have left to live. A painless laser pulse is applied to the surface of the skin through a wristwatch-style device. It analyses endothelial cells measuring how the body will decline with age, giving a measure of the lifespan. A user-friendly version of the system is expected to be completed within the next three years. Would you buy one?