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Déjà vu is an uncanny feeling or illusion of having already seen or experienced something that is being experienced for the first time. If we assume that the experience is actually of a remembered event, then déjà vu probably occurs because an original experience was not fully attended to and elaborately encoded. If so, then it would seem most likely that the present situation triggers the recollection of a fragment from one's past. The experience may seem uncanny if the memory is so fragmented that no strong connections can be made between the fragment and other memories.

Dowsing is the action of a person--called the dowser--using a rod, stick or other device--called a dowsing rod, dowsing stick, doodlebug (when used to locate oil) or divining rod--to locate such things as underground water, hidden metal, buried treasure, oil, lost persons, etc. Since dowsing is not based upon any known scientific or empirical laws or forces of nature, it should be considered a type of divination. The dowser tries to locate objects by occult means.

Dreams are mental activities occurring during sleep. Most dreams occur in conjunction with rapid eye movements; hence, they are said to occur during REM-sleep, a period typically taking up 20-25% of sleep time. Infants are believed to dream during about 50% of their sleep time. Dreams occurring during non-REM periods are said to occur during NREM-sleep.

Dreamwork - interpretation of dreams is an ancient practice dating from earliest history and found in most cultures. Individuals have explored their own dreams and also consulted experts such as prophets, shamans or in this century, psychotherapists. The goals and guiding principles of dreamwork vary, but they have in common the belief that dreams are meaningful. Techniques of dream exploration include discussion of cultural symbols (archetypes), the dreamer's own associations and feelings and of the combined insights of a group. Goals may include self-knowledge, enhanced creativity, healing or wisdom.

The druids were the "wise ones" of the Celts. Although dozens of books have been written about them, almost nothing is known about the druids. Their beliefs were esoteric and passed on orally. Their practices, for the most part, were not public. With no written tradition and no major temples where art might provide a key to some of the druids' activities, we must rely upon the words and speculations of foreign observers. The druids are mentioned by the ancient Roman authors Strabo, Diodorus, Posidonius and Julius Caesar, who portray them as overseeing bloody religious rituals. Hence, the druids are often thought of as having primarily a religious function and are often called 'priests.' Diodorus calls them 'philosophers.' Strabo calls them bards and soothsayers with a reputation for mediation. Whatever they were, the druids enjoyed a position of high status in Celtic society very unlike the position of modern "druids" who find solace communing with grass or the wind while parading around stone circles. Modern "druids" treat Stonehenge and other megalithic monuments of the British Isles as places of worship. All of the stone circles, menhirs, dolmens, etc., of the British Isles were constructed by peoples who pre-dated the Celts by one to three thousand years. Stonehenge, for example, was built over a period of centuries, from 2800 BC to 1550 BC. The Celts did not arrive in the British Isles until long after the great megaliths had been erected.

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