They long for warmness!

Hot meals grown cold and cold drinks gone warm can spoil the joy of eating and drinking. An Iowa company, Roccia Bollente manufactures a product named Dining Stones. These are 15- and 23-cm granite plates which are placed under the plates of guests. In a 180 ºC oven granite warms in 15 minutes and cools down in 45. If placed in a deep fridge, they remain cold for a long time.