At the peak of the Great Recession, unemployment reached what percentage?

Charles Gross discovered a single neuron that was sensitive to stimuli when he

A) presented multi-colored squares to the monkey. B) allowed graduate students to pick the stimuli to show the monkey. C) disconnected the apparatus and allowed the monkey to react naturally. D) waved "good night" to the monkey.

Which of the following has most directly contributed to falling population levels in Russia?

a. domestic factories closing in the face of international competition b. higher levels of employment among women c. longer work hours driven by a booming economy d. high prices on imported goods due to severe import tariffs