engines

It seems to me that power stations waste an awful lot of heat in their cooling towers. Now you cant seriously tell me that this: Isnt a serious waste of energy. So heres the question: Why not use stirling engines to recover this waste energy and improve the efficiency of the power plant?

I've seen pens sold at drug stores with a numbered ball filled chamber at the end. You are supposed to shake the pen until 5 balls slide into a tube as a way to predict your lottery numbers. But I think they actually decrease you chances of winning the lottery. For example, in a 5 number game...