Many historians and scientists believe that the first inhabitants of the Philippine islands emerged during the Pleistocene period. Noted social scientist Henry Otley Beyer believes that Filipinos descended from different groups that came from Southeast Asia in successive waves of migration. While Jocano believes that Asians, including Filipinos are the result of a lengthy process of evolution and migration. Migration Theory. They did not have any knowledge of agriculture, and lived by hunting and fishing.
Is Carbon Dating Accurate?
Pigments through the Ages - Dating works
The Flint water crisis was a public health crisis that started in and lasted until ,  after the drinking water for the city of Flint, Michigan was contaminated with lead and possibly Legionella bacteria. Residents complained about the taste, smell, and appearance of the water. Officials failed to apply corrosion inhibitors to the water, which resulted in lead from aging pipes leaching into the water supply, exposing around , residents to elevated lead levels. Shortly thereafter, President Barack Obama declared a federal state of emergency, authorizing additional help from the Federal Emergency Management Agency and the Department of Homeland Security. The water supply change was considered a possible cause of an outbreak of Legionnaires' disease in the county that killed 12 people and affected another 87, but the original source of the bacteria was never found. Fifteen criminal cases have been filed against local and state officials,  but only one minor conviction has been obtained, and all other charges have been dismissed or dropped. An extensive lead service pipe replacement effort has been underway since , with innovative techniques such as machine learning used to predict the number and location of lead pipes.
Traditional ceramics , ceramic materials that are derived from common, naturally occurring raw materials such as clay minerals and quartz sand. Through industrial processes that have been practiced in some form for centuries, these materials are made into such familiar products as china tableware, clay brick and tile, industrial abrasives and refractory linings, and portland cement. This article describes the basic characteristics of the raw materials commonly used in traditional ceramics , and it surveys the general processes that are followed in the fabrication of most traditional ceramic objects. From this survey the reader can proceed to more detailed articles on the individual types of ceramic products, links to which are provided at the end of this article.
The Glozel artifacts are a collection of over 3, artifacts , including clay tablets, sculptures and vases, some of which were inscribed, discovered from to in the vicinity of French hamlet of Glozel. Variously dated to at times Neolithic , Iron Age and Medieval times, the finds initiated a series of claims, counterclaims and heated debates among archaeologists. The objects were all initially dismissed as a hoax.