While treaty abrogation is always available in theory, the politics of arms control in democratic nations makes it impractical.

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In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

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In theory, this ought to give Congress, the administration and the Pentagon a measure of control over private firms.

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In theory, as the owners of the company, shareholders should be able to keep executives under control.

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Their theory is that this variety of receptor might help, in normal circumstances, to keep control over the brain's response to huge hormonal changes during and immediately after pregnancy.

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