The professor says Angela missed class. Angela says she was there, but aliens from outer space caused her to be invisible. Why do we prefer the professor's account of the event?

a. It is more open-minded

The most optimal behavioral state for most research with infants

a. is awake/alert b. is the transition between sleep and waking c. is the transition between deep sleep and light sleep d. comprises approximately 45 percent of the average newborn infant's day

In Vaillant's original study, subjects who were heavy smokers, alcohol abusers, and overweight at age 50, were more likely to be dead by 75–80, and those who were still alive were likely to be classified as ____

a. happy-well b. sad-sick c. depressed-morbid d. joyful-elated