When US President Barack Obama signed the latest arms-control treaty with Russia in April 2010, he called it "an important first step". But the administration has been tripped up by Republican opposition to the New Strategic Arms Reduction Treaty (New START), which would reduce both nations' arsenals by roughly one-third. The Republicans are blocking the treaty with pseudoscientific arguments about the state of the country's weapons complex. Yet it is politics, not science, that is behind their move.
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