This ability to make copies of DNA, as simple as it sounds, has transformed our world. DNA的这种复制能力听起来很简单，却改变了我们的世界。 Scientists use it every day to detect and address disease, to create innovative medic
According to researchers at the University of New Hampshire 根据新罕布什尔大学的调查研究， seven percent of all child pornography possession arrests are teens, sexting consensually with other teens. 因儿童色情被捕的人群中，有百分之
The President was in South Florida today at Miami Central Senior High School, kicking off a month focusing on education. Miami Central has received more than $750,000 in federal School Improvement Gra
