One day a Paris newspaper gave an advertisement  about a very cheap and pleasant way of travelling for 25 centimes. Many people believed it and sent the money.

A few days later each of them got a letter. The letter read: «Sir, rest in bed and remember that the Earth turns. Paris stands at the 49th parallel. At the 49th parallel you travel more than 25,000 kilometres a day. You may look out of the window and watch the beautiful sky.»