What motivated the inhabitants of Neolithic Jericho to construct fortification walls?

What was Lee de Forest's position on the role of radio?

a. It should raise the cultural level of its listeners. b. It was a fertile area for the profit of its advertisers. c. It should be subject to firm government regulations. d. Advertisers should have a major voice in programming.

The slowed-down style of music that evolved from ska in the late 1960's was known as ________.

Fill in the blank(s) with the appropriate word(s).