  a coincidence (often stated as a mere coincidence) is a collection of two or more events or conditions, closely related by time, space, form, or other associations which appear unlikely to bear a relationship as either cause to effect or effects of a shared cause, within the observer's or observers' understanding of what cause can produce what effects. the word is derived from the latin cum- ("with", "together") and incidere (a composed verb from "in" and "cadere": "to fall on", "to happen"). in science, the term is generally used in a more literal translation, e.g., referring to when two rays of light strike a surface at the same point at the same time. in this usage of coincidence, there is no implication that the alignment of events is surprising, noteworthy or non-causal. from a statistical perspective, coincidences are inevitable and often less remarkable than they may appear intuitively. an example is the birthday problem, where the probability of two individuals sharing a birthday already exceeds 50% with a group of only 23.  ==computerâsimulation of alignments==   alignments of random points, as shown by statistics, can be found when a large number of random points are marked on a bounded flat surface. this might be used to show that ley lines exist due to chance alone (as opposed to supernatural or anthropological explanations). computer simulations show that random points on a plane tend to form alignments similar to those found by ley hunters, also suggesting that ley lines may be generated by chance. this phenomenon occurs regardless of whether the points are generated pseudo-randomly by computer, or from data sets of mundane features such as pizza restaurants. it is easy to find alignments of 4 to 8 points in reasonably small data sets. ==coincidenc
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