If you're trying to find the best cell phone network where you live, don't just rely on carrier coverage maps or speed claims -- which are often based on theoretical maximum output from cell towers.
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Based on a theoretical risk alone, the executives argue, Merck took care to watch for heart attacks and strokes in its big clinical trial.
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And positioning now for a theoretical rally based on an opinion is dangerous.
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This online survey is not based on a probability sample and therefore no estimate of theoretical sampling error can be calculated.
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Given our dependence on the communication systems of our planet, both satellite- and ground-based, this is not simply a theoretical worry.
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