bet365 Play online games American Technology News Network reported on October 21，The sharp change of the climate of Eastern Africa about 400,000 years ago may contribute to the progress of local ancient human tools。This result was studied by Rick Potts, a ancient anthropologist in the Smithson Society of Washington, USA.。

Bet365 lotto review Researchers drill and extract the core of the Kenya Kula Basin，Observing environmental changes in hundreds of thousands of years。Research and analysis of rock cores，For a long time，The supply of food and water in the area has always been quite stable。But from about 400,000 years ago，East Africa's climate began to fluctuate violently。The fault caused by the outbreak of the volcanic burst crushed the landform support，Lake area is reduced; vegetation changes are switched back and forth bet365 best casino games between grasslands and forests; large animals such as elephants are extinct locally，Instead, it is a more diverse small animal with food。

Coincidentally，from 500,000 to 320,000 years ago，Ancient humans used at the ancient human beings living at the Ohogselli site in Kenya (about 22 kilometers from the rock core drilling location) also changed，cutting tools made from local stones，Smaller made of foreign stone、More fine tools。Researchers said，smaller、More fine stone Bet365 lotto review tools may be tailor -made for hunting and processing less prey。Pots think，This technical transformation and the exchange or trade between objects between ancient human groups，It may be caused by the instability of food and water resources。

　　（Yan Yong/Compilation）