If you are asking why you cannot get a positive test in week 1, you are not alone. Many people hope for early answers, but the body follows its own schedule. In the first week, your body has not ...

At head of title: DK Smithsonian. "The ultimate visual guide to the discoveries that shaped the world"--Cover. Before science began (2.5 MYA -- 799 C.E.) : Early metallurgy ; The story of the wheel ; ...