综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

WASHINGTON - Jet-lagged mice die younger, researchers said on Monday in a study that suggests that working unusual shifts and flying back and forth across time zones takes a permanent toll on health.

Tests on more than 100 mice showed that old mice forced to live on a confusing schedules of light and darkness, simulating rotating shifts or international travel, died sooner than those on gentler schedules.