Concentration (game) as an educational game. Any deck of playing cards may be used, although there are also commercial sets of cards with images. The rules given here are for a standard deck of 52 cards, which are normally laid face down in four rows of 13 cards each. The two jokers may be included for a total of six rows of nine cards each. Additional packs can be used for added interest. Standard rules need not be followed: the cards can be spread out anywhere, such as all around a room. In turn, each player chooses two cards and turns them
Wild Cards Wild Cards Wild Cards is a series of science fiction superhero shared universe anthologies, mosaic novels, and solo novels written by a collection of more than forty authors referred to as the Wild Cards Trust and edited by George R. R. Martin and co-edited by Melinda M. Snodgrass. Set largely during an alternate history of post-World War II United States, the series follows humans who contracted the Wild Card virus, an alien virus that rewrites DNA and mutates survivors; those who acquire crippling and/or repulsive physical conditions are known as Jokers, while those who acquire superhuman abilities are known as