Try rubbing(Ħ²Á) the tip of your finger backwards and forwards very quickly on your coat or a blanket. It should become hot. In cold weather we sometimes rub our hands together to make them warm. The rubbing of two together which causes heat is called “friction”(Ħ²ÁÁ¦). In the same way, people who lived in caves rubbed a piece of wood shaped like a pencil on another piece of wood with dried leaves or grass packed nearby. The heat set the leaves or grass alight. This was a difficult way of making fire. Better ways were found by using flint(»ðʯ), but it was not until 1827 that the first matches were made in England.