The app allows emergency managers, for example, to track geotagged tweets by particular hashtags, which can help them pin down the locations of particular problems based on tweeting.

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Torrents are scattered, diverse and hard to pin down, and that makes them incredibly hard to stop.

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Voters still cannot pin him down, and this makes them uneasy.

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But they say this is an advantage, because it means that cancer cells can be identified without having to pin down the precise molecular markers which make them different from healthy cells.

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The amount of caffeine in energy drinks is hard to pin down, because many are marketed as supplements, rather than as foods, allowing them to wiggle around FDA regulations and labeling laws.

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Instead, they seem to have wrestled large prey down by stabbing them with 15-foot spears in a kind of savage version of pin the tail on the bison.

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