One marriage expert says parents' behavior should depend on the age of their kids, and also on a tougher criterion: how the couple argue.

一位婚姻专家说，父母的行为应当取决于孩子的年龄，也取决于一个更严格的标准：两口子吵架的方式是什么样的。

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Psychologist Susan Levine, an expert on mathematics development in young children the University of Chicago, found children who play with puzzles between the age of 2 and 4 later develop better spatial skills.

心理学家苏珊·莱文是芝加哥大学研究幼儿数学发展的专家。她发现，在2岁至4岁之间玩拼图的孩子在后来会发展出更好的空间能力。

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"I am willing to bet Justice Souter had never seen a file-sharing application, " said Tushnet, who is also an expert on cyber-age legal issues.

CNN: Souter known as low-key, fierce defender of individual rights

The remains may be from late Iron Age or early Roman era, an expert said.

BBC: Human and animal remains at the site

Child protection expert Jim Gamble said Facebook's age policy was difficult to check.

BBC: Dad of girl, 12, sues Facebook over her suggestive photos