It must be the season for exploding rockets: The US Army's experimental Advanced Hypersonic Weapon, which will eventually be able to bomb anywhere in the world within an hour, exploded just four seconds after launch in Alaska. Similar to last week's self-detonating SpaceX rocket, the US Department of Defense detected an error within the system shortly after launch, and thus decided to detonate the entire thing rather than risk any extra collateral damage. No one was injured by the incident, though falling debris did damage the rocket's Kodiak Launch Complex.