this is a brilliant and well conceived series ... very interesting from start to finish and discusses the origins of scientific measurement from ancient to modern ... covers distance, temperature, weight, time and other scientific disciplines requiring more exact methods for modern use. BUT .... WHATS THE HELL JUSTIFIES THIS PRICE OF NEARLY £50 ... 3 episodes of less than an hour each ( thats 1 dvd ). PRICE KEEPS GOING UP .... WHY ????