Michaels and his colleagues watched students play pool in the student union at Virginia Tech. When four observers came up to watch the pool players, players did than they had when playing without the audience.

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.