This drug, classified as an opiate, produces a rush of pleasure when injected and is likely to lead to serious addiction. What is it?

You test an 11-year-old child and find she has a mental age of 10. What is her IQ?

a) 91 b) 100 c) 111 d) 122

The spongy tissue of the cerebral cortex that is made up mostly of cell bodies is called

a. white matter. b. gray matter. c. the limbic system. d. the synaptic vesicle.