From Jenna Orkin

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China and Russia have deployed hypersonic missiles that could start World War III. But it's the smaller conflicts that pose the biggest threat.

• While ballistic missiles travel in soaring, predictable parabolic arcs, like punted footballs, hypersonic missiles are more like speedy hockey pucks that keep low and change direction in an instant.
• The high velocity means more damage; the maneuverability and lower altitude make them harder to track and intercept.
• But for the Pentagon, the scariest thing about hypersonic weapons is that China and Russia have already deployed them in the field, while the United States is still developing them.