cookware is used for cooking & cooking food requires adding heat energy to the food -> skeleton poison requires adding light matter to the poison rest things cooking food requires adding heat energy to the food using cookware  skeleton poison requires adding light matter to the poison rest things -> cooking food requires cookware to be able to transfer heat cooking food requires cookware to be able to transfer heat  cooking food requires cookware to be able to transfer heat & a ergonal matter insulator crossing light -> cooking requires the cookware to be a thermal conductor