As stated earlier, religion typically regards the interaction of natural and supernatural phenomena. Put simply, a supernatural force is a figure or energy that does not follow natural law. In other words, it is nonempirical and cannot be measured or observed by normal means. Religious practices rely on contact and interaction with a wide range of supernatural forces of varying degrees of complexity and specificity. In many religious traditions, there are both supernatural deities, or gods who are named and have the ability to change human fortunes, and spirits, who are less powerful and not always identified by name. Spirit or spirits can be diffuse and perceived as a field of energy or an unnamed force. Practitioners of witchcraft and sorcery manipulate a supposed supernatural force that is often referred to by the term mana, first identified in Polynesia among the Maori of New Zealand (mana is a Maori word). Anthropologists see a similar supposed sacred energy field in many different religious traditions and now use this word to refer to that energy force. Mana is an impersonal (unnamed and unidentified) force that can adhere for varying periods of time to people or animate and inanimate objects to make them sacred. One example is in the biblical story that appears in Mark 5:25–30, in which a woman suffering an illness simply touches Jesus’s cloak and is healed. Jesus asks, “Who touched my clothes?” because he recognizes that some of this force has passed from him to the woman who was ill in order to heal her. Many Christians see the person of Jesus as sacred and holy from the time of his baptism by the Holy Spirit. Christian baptism in many traditions is meant as a duplication or repetition of Christ’s baptism. There are also named and known supernatural deities. A deity is a god or goddess. Most often conceived as humanlike, gods (male) and goddesses (female) are typically named beings with individual personalities and interests. Monotheistic religions focus on a single named god or goddess, and polytheistic religions are built around a pantheon, or group, of gods and/or goddesses, each usually specializing in a specific sort of behavior or action. And there are spirits, which tend to be associated with very specific (and narrower) activities, such as earth spirits or guardian spirits (or angels). Some spirits emanate from or are connected directly to humans, such as ghosts and ancestor spirits, which may be attached to specific individuals, families, or places. In some patrilineal societies, ancestor spirits require a great deal of sacrifice from the living. This veneration of the dead can consume large quantities of resources. In the Philippines, the practice of venerating the ancestor spirits involves elaborate house shrines, altars, and food offerings. In central Madagascar, the Merino people practice a regular “turning of the bones,” called famidihana. Every five to seven years, a family will disinter some of their deceased family members and replace their burial clothing with new, expensive silk garments as a form of remembrance and to honor all of their ancestors. In both of these cases, ancestor spirits are believed to continue to have an effect on their living relatives, and failure to carry out these rituals is believed to put the living at risk of harm from the dead.