When a mysterious crescent appeared over Moscow in 1967, alien enthusiasts were unaware they were actually tracking a 3-megaton weapon designed to bypass American radar.

Global tensions are reaching a boiling point as Vladimir Putin places nuclear weapons back at the center of world politics.

Iran has publicly vowed to resist any military attack by the United States, warning that its forces are prepared to respond immediately and powerfully if aggression occurs — even as it insists it is ...

Add Yahoo as a preferred source to see more of our stories on Google. 'Better than North Face': This popular $90 ski jacket is down to $36 — that's 60% off ...