They called them "tea bombs". 6. The wristwatch It is not true that wristwatches were invented specifically for World War One - but it is true that their use by men took off dramatically.

But when World War One started they became weapons ... to be created urgently to protect soldiers during an attack. But inventions must never be discovered by the enemy. British engineers ...

Although often overshadowed by the heroics and horrors of World War ... And first, one belligerent and then the other has met crucial emergencies by ingenious, no to say startling, inventions.