The prefrontal cortex is the most peculiarly enlarged part of the brain in human beings, but whereas the part near the top of the head generally seems to be involved in conventional intelligence, the "orbital" region tends to handle the processing of social information that is, assessing the moods and personalities of other people.

WSJ: The Social Network and the Dunbar Number | Mind & Matter

The first is a startup that plans to have a large national or international audience that means it will grow into a sizable business in terms of revenue, and in most cases, employee headcount (although many software businesses can now handle many millions of customers with reasonably low head counts).

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It can handle multiple hits in one accident, Haupt says, and covers more of the head than a standard helmet.

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