Controlling for everything else, a child who has been to pre-school is 15 percentage points more likely to be ready for kindergarten than a playmate who has not.

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Elie became one of the most high-profile online poker processors and even married a former Playboy Playmate, Destiny Davis, the day after he was indicted.

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Despite incidents such as the recent death of a 6-year-old New Jersey boy shot in the head by a 4-year-old playmate, as well as the accidental shooting of a Tennessee sheriff's deputy's wife by a 4-year-old boy, accidental firearms deaths are rare among children.

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When one of the orang-utans displayed an open, gaping mouth, its playmate would often display the same expression less than half a second later.

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