Other times, though, the pigeon had to tap a tiresome 20 pecks before the light turned green and the grain was delivered.
ECONOMIST: Puritanical pigeons
The green revolution, which spread enabling technologies of high-yield agriculture across the planet, resulted in doubling of grain production.
FORBES: Thomas Malthus: Wrong Yesterday, Right Today?
应用推荐
模块上移
模块下移
不移动