Amazon plans to recoup its investment in the Kindle Fire, and earn a little profit by selling digital content like e-books, music and movies to the large Kindle Fire user base.

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The first digital camera prototype is closest to the fire ant's compound eyes, which only have 180 of these optical units, called ommatidia.

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Moreover, Amazon can use cross-subsidies from the sale of digital content to keep the price of the Fire down, something that rival tablet-makers who do not sell content cannot do.

ECONOMIST: Brain scan