Central African farmers don't have any animal power because sleeping sickness kills all the animals - cattle, the horses, the burros and the mules. So draft animals don't exist, and farming is all by hand, and the hand tools are hoes and machetes.

Supplying food to sub-Saharan African countries is made very complex because of a lack of infrastructure.

Africa needs roads. Roads bring know-how and fertilizer to farmers and ideas and business for commerce.

Abnormal stresses and strains tend to accentuate man's animal instincts and provoke irrational and socially disruptive behavior among the less stable individuals in the maddening crowd.

Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.

Escherichia colia O157:H7 is a relatively new strain of the common intestinal bacteria (no one had seen it before 1980) that thrives in feedlot cattle, 40 percent of which carry it in their gut. Ingesting as few as ten of these microbes can cause a fatal infection; they produce a toxin that destroys human kidneys.