According to the Centers for Disease Control, approximately how many children are at risk for lead poisoning due to exposure to potentially toxic levels of lead?

Ralph's long­time girlfriend Amy dumped him during his junior year in college

When asked why he hasn't dated much in the last five years, he says that "he'll never be able to truly trust another woman after what Amy did to him." According to REBT, Ralph a. has lost meaningfulness in his life and needs to make the courageous choice to find love. b. is exhibiting learned helplessness and avoidance conditioning. c. is exhibiting the defense mechanism of regression. d. has an irrational belief that because something once strongly affected him, it will do so forever.

Describe the difference between conducting a key word search on the Web and PsycINFO

What will be an ideal response?