Flywheels do the same but they "encapsulate" the energy in their rotation momentum, at some 65,000 rpm. Pumped hydro does what it says: it pumps water uphill and then re-harvests the energy of the falling stream with a water turbine. Compressed air is also simple to understand, because it uses air pressure to store the energy.

Seoul's unification ministry said more than half of the 123 South Korean companies based in the zone willas part of the trial.

MBA Business economics graduates are ahead of the curve in terms of earning potential too, with starting salaries around 75,000 per year, depending on the area of study.

However she repeatedly breached the terms of the order, and in 2010council workers secretly set up measuring equipment in a neighbour's home to measure her sound levels.

Associated Press mentioned that the item expected to get the most attention is a 1931 poster for 'Dracula' starring Bela Lugosi. Actor Nicolas Cage sold an identical poster in 2009 for $310,000.