Examlex
Twitter is a free microblogging service that allows its users to send and read other users' updates.
Concrete Operational Thinking
A stage in cognitive development where children are able to think logically about concrete events and objects.
Adolescent
An individual in the stage of development between childhood and adulthood, typically between the ages of 10 and 19.
Sleep
A natural periodic state of rest for the mind and body, marked by altered consciousness and reduced sensory and muscle activity.
Puberty
The developmental stage during which a child's body matures into an adult body capable of sexual reproduction.
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