Which of the following factors is a major reason for the high risk of drought in Africa? A. Africa has been getting less rainfal
l since 1968. B. Civil wars have led to the destruction of crops. C. The rising elephant population has destroyed watersheds. D. The Aswan Dam changed the course of the Nile River
The conceiver of one of mankind's coolest ideas for boundless clean energy died last week. He was 90 and first published his ideas in 1968, a year before NASA put a man on the moon. In its December 1972 issue, Popular Science described engineer Peter Glaser's proposal:
