Planes were a very new invention, they were rare and fragile. But when World War One started they became weapons. Pilots could spy on enemy targets and the first bombs were dropped from the air.

Planes were a very new invention, they were rare and fragile. But when World War One started they became weapons. Pilots could spy on enemy targets and the first bombs were dropped from the air.

BBC One Opening the World War One commemoration season on the BBC ... of British soldiers that would come to face these horrific weapons. BBC Productions, Scotland - 1x60 minutes.

Donald Trump called on the world to agree to nuclear disarmament because "the power of nuclear weapons is crazy".