Littlewood's law states that a person can expect to experience events with odds of one in a million (referred to as a "miracle") at the rate of about one per month.
It seeks, among other things, to debunk one element of supposed supernatural phenomenology and is related to the more general law of truly large numbers, which states that with a sample size large enough, any outrageous (in terms of probability model of single sample) thing is likely to happen.
For example, in the game of bridge, the probability that a player will be dealt 13 cards of the same suit is extremely low (Littlewood calculates it as
people in England each play an average of 30 bridge hands a week, it becomes quite expected that such a "miracle" would happen approximately once per year.
This statement was later reformulated as Littlewood's law of miracles by Freeman Dyson, in a 2004 review of the book Debunked!