美泰玩具召回中国产产品
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科学60秒:飞行的代价
More than 60 mammal species—like the famous flying squirrel—have adapted the ability to sail from tree to tree. , yes. But what’s the evolutionary advantage? One theory suggests gliding save...
背诵美文——儿童的数学能力
Children’s Numerical SkillsPeople appear to be born to compute. The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical m...
CNN新闻100篇 News Item 18
CNNGovernor Arnold Schwarzenegger says he refuses to borrow money to keep his state running, he wants legislators to focus on the state's 24 billion dollar deficit or the state could be forced to...
寻找西部淘金热时期的定居者
The problem of slavery continued to divide the North and South. Northerners warned that slavery could spread no farther. Southerners threatened to leave the Union unless southern rights were pro...