Today a band of terrorists hijacked an advertising blimp (actually a dirigible) and flew it into a building.
What they didn't know is that a blimp is, of course, a kind of balloon, an empty shell filled with helium. Despite its size it possesses very little mass and, with its limited speed, is completely useless as a missile.
The blimp bumped, sort of clumped, into the building and crumpled, sprang a leak and began to sink slowly. There was no fire, since helium, a noble gas, does not burn. By the time the blimp reached the ground the police were waiting.
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