5 facts that explain cyber warfare

America has spent decades and trillions of dollars building up the greatest military force the world has ever seen.

But the biggest threat to national security these days comes from not from aircraft carriers or infantry divisions, but a computer with a simple Internet connection. That much became clear after the catastrophic hack-most likely by a foreign power-of sensitive federal employee data stored online.

These 5 stats explain the evolution of cyber warfare, its astronomical costs and its increasingly important role in geopolitics.
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