Chemical substances may be combined or converted to others by means of chemical reactions. Forms of energy, such as light and heat, are not matter, and are thus not substances in this regard.
Halophiles are organisms that thrive in high salt concentrations. They are a type of extremophile organism. The name comes from the Greek word for salt-loving. While most halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina or fungus Wallemia ichthyophaga. Some well-known species give off a red color from carotenoid compounds, notably bacteriorhodopsin.
Paraphilic infantilism is the psychoanalytical term used for those who like to engage in being treated as an infant or toddler. Adults who engage in play mimicking an infant are known as adult babies. About one in three adult babies are also referred to as diaper lovers. The majority of adult babies are heterosexual males. Adult babies, whether diaper wearers or not, historically do not have a sexual preference for children. Adult baby fantasies include being free of guilt, responsibility, or control and while some act completely like babies at times, others practice in discretion.