Patients selecting mechanical heart valve replacements are typically required to monitor their INR levels (international normalized ratio) to prevent risks of blood clotting, hemorrhage or stroke. To ease this process, home INR testing machines are now becoming more affordable and easy-to-use.
Archaeologists and historians don't know exactly how Egyptian civilization evolved. It is believed that humans started living along the Nile's banks starting in about 6,000 B.C.E. For the earliest inhabitants of the Nile Valley food was not easy to find.
A river civilization or river culture is an agricultural nation or civilization situated beside (and often drawing sustenance from) a river. Historically the first great civilizations all grew up in river valleys. The oldest, 3500 to 2000 B.C.E., was along the Tigris and Euphrates rivers in the Middle East; the name given to that civilization, Mesopotamia, means between the rivers.