The theory is that these large, pictorial networks mirror the way our brains work, making it easier to spot connections and insert new ideas.

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With both tablets and televisions, as with phones, Google is also likely to insert new ways to put in advertising, its mainstay means to money.

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In particular, some developing countries are angry at what they see as western nations' attempts to insert new loopholes into regulations on how emissions from land use change are accounted for, which could allow western nations to cut actual emissions by less than they have pledged.

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