Display rules are said to be __________ but not necessarily __________.

The median age (the age at which half the population is older and half is younger) has increased dramatically in the developed world because:

a) the baby boom generation is dying off. b) life expectancy has risen. c) birth rates have risen. d) people have children at younger ages.

What did Alice Isen and her colleagues find that facilitated creativity?

a) practice b) classical music c) positive feelings d) early exposure to creative situations