The Pentagon is set to declare operational soon a multibillion dollar system intended to defend America from attack by ballistic missiles, but which critics say will not work.
The U.S. Air Force quietly has put into service a new weapon designed to jam enemy satellite communications, a significant step toward U.S. control of space.
Stockpiles of weapon-grade plutonium and uranium are growing around the world, despite efforts to curtail the proliferation of nuclear materials.
Iran could acquire a nuclear bomb in the next one to four years and would become more willing to aid terrorist groups once it has an atomic capability, according to a study by the Non-proliferation Policy Education Center.
A revived debate in Washington over possible diplomatic engagement with Iran has been fueled by the growing fear that Tehran is determined to become a nuclear power and time is running out to stop it.
Old people may hold the key to human civilization according to new research. They found evidence that, around 30,000 years ago, many more people started living into old age, in turn fueling a population explosion.
Airlines could face growing danger from attackers armed with new shoulder-launched missiles unless states make a major effort to control their spread.
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Russia faces grave environmental and terrorist threats unless donors accelerate a slow trickle of international aid for dismantling its rusting nuclear submarines, a senior official said.
An independent review of the multibillion-dollar U.S. ballistic missile shield due to start operating by Sept. 30 finds that it is technically incapable of shooting down any incoming warheads.
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Scientists at a heavily-guarded installation called Vector, deep in Siberia, are still conducting research on 120 strains of the Smallpox virus in order to study the origins of the virus and its genetic blueprint, and to seek new vaccines and anti-viral agents.