Fire is a rapid oxidation process that creates light, heat, smoke, and releases energy in varying intensities. It is commonly used to describe either a fuel in a state of combustion (e.g., a campfire, or a lit fireplace or stove) or a violent, destructive and uncontrolled burning (e.g., in buildings or a wildfire). The discovery of how to make fire is considered one of humankind's most important advances, allowing higher hominids to ward off wild animals, cook food, and control their own source of light and warmth.
For humans, haircut, hairstyle, or hairdo normally describe cutting or styling head hair. Unlike other animals, human beings of many cultures cut their hair, rather than letting it grow naturally. Hair styles are often used to signal cultural, social, and ethnic identity and can be used to illustrate social status or individuality. Men and women naturally have the same hair, with the primary component of hair fiber being keratin. Keratins are proteins, long chains of amino acids. Generally, hairstyles conform to cultural influences of gender. Fashion trends may have a great influence depending on the person.