"Only God knows what is in the ground, but what they have delineated so far has been big on tonnage, light on grade, and a lot of it is deep, " says John Ing, a gold analyst at Maison Placements Canada.

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However, once the grade depths were confirmed, light was focused on the surface.

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The light-water reactor, which is not capable of producing weapons-grade plutonium, was promised to North Korea in the early 1990s for the North giving up its nuclear weapons.

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In 1994, North Korea agreed to stop making plutonium, in return for which America and its allies would supply the country with fuel oil and build two Western-designed light-water nuclear reactors (since it is a bit harder to produce weapons-grade materials from such reactors than from the ones North Korea had been building).

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After all, the commercially viable incandescent light bulb was the product of an entire team, not the single inventor we were taught in fifth grade.

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