THE PRESIDENT:  Good afternoon, everybody.  Today, the United States — together with our allies and partners — has reached a historic understanding with Iran, which, if fully implemented, will prevent it from obtaining a nuclear weapon. As President and Commander-in-Chief, I have no greater responsibility than the security of the American people.  And I am […]

On February 15 at 3:20:26 UTC, a supersonic flying space rock, roughly the size of a van or a small truck, entered Earth’s atmosphere, exploded at 24,140 meters over Russia’s Chelyabinsk, and produced a total destructive blast power of 500 kilotons. This means the destructive power yield was 30 times the blast yield of the […]