A shovel is a tool for lifting and moving loose material such as coal, gravel, snow, soil, or sand and is an extremely common tool which is used extensively in agriculture, construction and gardening. It is usually a hand tool consisting of a broad blade with edges or sides that is fixed to a medium-length handle.
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Mental retardation is a triarchic disorder, characterized by subaverage cognitive functioning and deficits in two or more adaptive behaviors with onset before the age of 18. Once focused almost entirely on cognition, the definition now includes both a component relating to mental functioning and one relating to the individual's functional skills in their environment.