I hate to be the one to disagree with all the doubters out there, but I have seen the magnet on a string thing work more than once. My Uncle is way over 90% accurate using this method on eggs. He is extremly accurate on pregant women, and I have seen him even use it to correctly guess the age of a lying woman. To dismiss this method as a myth or wifes tale is up to the individual reader. But Science will never convince me the method doesnt work. As one old professor once said, "If what works in the field doesnt agree with what works in the books, You go with what works in the field."