A monkey (held by an electromagnet) in a "tree" will fall when startled by blowgun fire (which breaks a wire to cut off the electromagnet current). The question for students is this: where should the ...

While we take it as just a fact of life today, before the 1950s and 1960s, many experts on child development treated affection as more of a luxury rather than a necessity. A psychologist named Harry ...

He took infant monkeys away from their real mothers, giving them instead two artificial mothers, one model made of wire and the other made of cloth. The wire model was outfitted with a bottle to ...