Like anyone I hate the idea of land mines that are left behind after a conflict to claim lives and limbs. However, they will continue to be manufactured to fill the military's demand. My idea is that an internal device should be designed to be easily incorporated (at little cost), to allow a mine to be set to be active for a limited time period (say two years) after which it would be inctive and largely harmless. There are a number of ways that this could be achieved: Incorporate a...