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concentrate – v. to think about something; to give your attention to the thing you are doing or reading
overdose – n. an amount of a drug or medicine that is too much and usually dangerous
executive functions – n. also known as cognitive control; the management memory, reasoning, task flexibility and problem solving, as well as planning and execution.
abstract – v. to deal with general ideas or qualities rather than specific people, objects or actions
skull – n. the bony structure that forms the head
swell – v. to become larger than normal; to enlarge
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