Did you know that scientist James Prescott Joule measured the difference in temperature of water at the top and at the bottom of the Cascades de Sallanches, now better known as the Cascade d'Arpenaz. His theory was that the water should heat up due to a change in kinetic and potential energy. What's even more interesting. He did this experiment during his honeymoon. A bit of a mixture of love, science, business and pleasure.