Ask any girl: What do you look for in a guy? The first answer is usually: a good sense of humor. With guys it is an important dating factor, but not quite as vital as with girls. If you think about it, being funny isn't easy. It takes good timing, a high degree of intelligence and the ability to 'read' people. In fact, you might say it's evolution at work.
A child mummy is found high in the Andes and the archaeologist says the child lived more than 2, years ago. How do scientists know how old an object or human remains are? What methods do they use and how do these methods work? In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon dating. Carbon dating is a way of determining the age of certain archeological artifacts of a biological origin up to about 50, years old.