Unexploded weapons are lingering threats. These days they are more likely to be cluster bombs, but an incredibly dangerous cargo ship of unexploded bombs is sitting in a sandbank in the River Thames estuary, UK.

　　Another war hangover is radioactive depleted uranium. This is used in anti-tank weapons and remains on the battlefield years later. Although the risks are still uncertain, there are moves to replace it with tungsten .

　　The mental after-effects of war are becoming more fully appreciated, with a growing understanding of post traumatic stress disorder. Researchers are also finding out more about debilitating effects of sleep deprivation on soldiers and other factors which contribute to friendly fire incidents.

　　Mass Destruction

　　Perhaps the worst after-effects are left by nuclear weapons. The atom bomb was first used or Hiroshima, Japan, in 1945, where radiation effects persist and massive arsenals of nuclear weapons were amassed during the cold war.

　　The original five nuclear powers attempted to control proliferation, but were criticized for increasing their own arsenals at the same time. Following controversy, the US bunker busting nuke intended as a first-strike weapon against non-nuclear states, was eventually cancelled.

　　Now there are nine nuclear powers and there is concern over government secrecy regarding atomic tests and safe transport of warheads.

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