92 known cases of nuclear bombs lost at sea

The very first bomb that the Allies dropped on Berlin in World War II killed the only elephant in the Berlin Zoo, it is said. The NATO attack on Serbia in 1999 (the Kosovo war) killed more animals than people.

"Smart" weapons, such as the Tomahawk missile is supposed to hit a postage stamp at 300km or more (200 miles or more). But only two out of thirteen actually hit the target. One skimmed over the house of a small farmer a few kilometres (miles) off target, straight up a track, through bushes, and exploded in the farmer's field, killing seven sheep, one cow and a goat. The farmer kept the missile nosecone as a souvenir.

To err is human. To really mess things up you need a computer

On 5 October 1960 an early-warning system warned the North American Aerospace Defence Command (NORAD) of a massive Soviet nuclear missile strike approaching the United States. What happened is that a fault in a computer system had removed two zeros from the radar's ranging components, detecting the missile attack at 4 000km (2,500 miles) away. The radar was actually detecting a reflection from the moon, located 400 000km (250,000 miles) away. More