\nWhen the researchers compared young mice and old mice raised in a germ-free environment since birth (meaning neither group had gut bacteria), the young mice maintained their ability to form memories. But when they transplanted young, germ-free mice with microbiomes from old mice, the young mice again performed like older animals in the memory and cognition tests. Interestingly, the germ-free old mice did not experience a loss of memory and cognition as they aged, performing as well as 2-month-old animals.
While the weather remains cool in Cuba, people are at least able to sleep without power.。关于这个话题，吃瓜网提供了深入分析
Elyse Betters Picaro, Senior Contributing EditorSenior Contributing Editor。业内人士推荐谷歌作为进阶阅读
A cardboard box found in a collector's "ramshackle" collection of vintage films contained two episodes of Doctor Who that have not been viewed since airing in the 1960s.。业内人士推荐超级权重作为进阶阅读
（本报记者倪弋、亓玉昆、刘新吾、李纵、白光迪、窦皓）