Archaeologists have found more than 12,000 Paleolithic stoneware items in northwest China's Shaanxi Province, local authorities said Tuesday

美国一项研究显示，全球气温上升可能会导致肾结石病例的增加，如果温室气体排放继续保持目前的速度，肾结石病例将增加2.2%至3.9%。 [Photo/IC] Cli

Observe a child; any one will do. You will see that not a day passes in which he does not find something or other to make him happy, though he may be in tears the next moment. Then look at a man; any one of us will do. You will notice that