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Monday, 11 May 2020



A vacation, or holiday, is a leave of absence from a regular occupation, or a specific trip or journey, usually for the purpose of recreation or tourism. People often take a vacation during specific holiday observances, or for specific festivals or celebrations. Vacations are often spent with friends or family.

A person may take a longer break from work, such as a sabbatical, gap year, or career break.

The concept of taking a vacation is a recent invention, and has developed through the last two centuries. Historically, the idea of travel for recreation was a luxury that only wealthy people could afford (see Grand Tour). In the Puritan culture of early America, taking a break from work for reasons other than weekly observance of the Sabbath was frowned upon. However, the modern concept of vacation was led by a later religious movement encouraging spiritual retreat and recreation. The notion of breaking from work periodically took root among the middle and working class.

A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents. On retrieval, the calculation is repeated and, in the event the check values do not match, corrective action can be taken against data corruption. 

CRCs can be used for error correction (see bitfilters).

CRCs are so called because the check (data verification) value is a redundancy (it expands the message without adding information) and the algorithm is based on cyclic codes. CRCs are popular because they are simple to implement in binary hardware, easy to analyze mathematically, and particularly good at detecting common errors caused by noise in transmission channels. Because the check value has a fixed length, the function that generates it is occasionally used as a hash function.

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