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In the second of three videos, we visit the central hub of New York City's 'Ring of Steel', the expansive camera network keeping watch over Lower Manhattan.

Steel's a done deal, right? A material we know all about, just as we move on to cooler composites? Nope.

As night fell on Friday in Japan, workers and soldiers continued heroic efforts to douse the potential meltdown underway at the Fukushima Daiichi nuclear power plant. The covering darkness is not the only reason for confusion: vital systems monitors have lost power, making the status of critical elements--such as the integrity of the nuclear fuel rods in reactor No.