This week alone, the Russian president unveiled two nuclear-capable weapons - but their value may be more symbolic than military.

Trump said the U.S. will test nuclear weapons “on an equal basis” with Russia and China. None of the three countries has ...

If an asteroid is on a collision course with the moon, what should humanity do? Try to nudge the space rock out of the way before it strikes? Obliterate it with a nuclear explosion? Such a cosmic ...