科学美国人60秒 | 狗狗的年龄怎么算?

【新朋友】点击标题下面蓝字【可可英语】加关注【老朋友】点击手机右上角图标【转发分享】内容听力文本This is Scientific American's 60-second Science, I'm Eliene Augenbraun.How old is your four-legged best friend? Common wisdom says that a dog ages seven years for every human year. But Tina Wang, a graduate student at the University of California, San Diego, wanted a more accurate assessment. Her quest started five years ago, when she rescued a dog from a shelter."I kind of just wanted to ask how old she was cause I felt like they were giving me an age that was very sensible, but I wasn't sure she was actually that old. So that kind of started this whole project."Wang worked in Trey Ideker's lab, where they study changing patterns of DNA methylation in humans. Small chemical entities called methyl groups attach to stretches of DNA, which a ………………………………