Page last updated at 14:57 GMT, Tuesday, 17 March 2009

Can a toddler resist marshmallow?

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David Baddiel, father of two, witnesses a ground-breaking experiment for the BBC's Horizon programme that suggests a child's destiny can be predicted at the age of four.

Horizon: Who Do You Want Your Child To Be will be broadcast on BBC Two on 16 March at 9pm.

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