Peru Farmers Revive 'Waru Waru' System By DREW BENSON Associated Press Writer ALTO CATACHA, Peru (AP)--Viewed from atop a rocky hill beside this remote hamlet, the worn earthen mounds and canals of an ancient farming system that once fed an empire stretch out to the horizon. The method faded out of use a millennium ago. But today it has been brought back to life by dozens of Indian communities located on the plains around Lake Titicaca as a way to protect crops against drought, floods and even frost damage. Known as ``waru waru,'' in the local Quechua language, the technique...