原文链接: http://environment.newscientist.com/channel/earth/mg19926721.600-the-ice-age-that-never-was.html The human brain is complex enough. But imagine if there were not one, but two, says Hannah Hoag BYLINE: Hannah Hoag. Hannah Hoag is a science writer based in Montreal, Canada SECTION: FEATURES; Cover Story; Pg. 28-31 LENGTH: 2098 words ANYONE in a long-term relationship will tell you that, at times, men are [...]