It gives a completely new meaning to the phrase 'rock 'n' roll'. For boffins have invented a cutting-edge gadget combining a portable music player and a toilet paper dispenser. The state-of-the-art device - called an iCarta - makes it easier for people to listen to beats while using the bathroom. It is designed, according to the US manufacturers, to "enhance your experience in the smallest room". The gadget, which costs around $99, or £54, merges an iPod docking station with a loo roll dispenser. After music lovers have downloaded songs from the internet on their iPod, they can place it...