A survey of 12,000 adults and children in the United States has shown that many people have lost a close connection with nature, although a wide cross-section of respondents expressed a desire to close that gap. The study, The Nature of Americans National Report, found that more than half of adults reported spending five hours or less in nature each week, and being satisfied with this small amount of time spent outdoors. Parents of children 8 to 12 years old said that their children spend three times as many hours with computers and televisions each week as they do playing outside. The study said it was common for older adults who grew up in an era before computers and the Internet to lament that children are spending less and less time in the natural world. "In particular," the report said, "older adults were concerned that younger generations are overly reliant on electronic media, unaware of how the natural world works, and unacquainted with the simple enjoyment of being outdoors."

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.