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The last ham and soldier across the border at the joint security area of the Korean North and South Korea, it was in a hail of bullets. A young man has since been identified as Private Travis King, an American soldier in the First Armored Division. And mountains can get really, really tall. But have you ever wondered what's stopping them from getting even taller? Well, allow our correspondent to explain.

Little is known about why he fled across the border into the hermit kingdom, but securing his release will require some tactical diplomacy. Given the tense relationship between both countries, is Kim Jong Un prepared to come to the table? A look at research which suggests gold might not always be an effective hedge against inflation (08:52). And, why mountains stop growing (15:42).

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