At a First Aid course I was on recently we eventually got onto the topic of defibrillators. Stand clear as a one off massive voltage shock is applied across the heart. Not a series of series of rhythmic shocks but just the one large shock is applied.  It seems that in...

You know how it is when you buy a new smart phone or computer and its all works so well at the start and you marvel at its wondrous speed. Then as you take more pics, add new apps, recharge it over and over, slowly but surely your fast new computer becomes frustrating...