The Neolithic Age is sometimes called the New Stone Age. Neolithic humans used stone tools like their earlier Stone Age ancestors, who eked out a marginal existence in small bands of hunter-gatherers during the last Ice Age.

Plant domestication: Cereals such as emmer wheat, einkorn wheat and barley were among the first crops domesticated by Neolithic farming communities in the Fertile Crescent. These early farmers also domesticated lentils, chickpeas, peas and flax.

Domestication is the process by which farmers select for desirable traits by breeding successive generations of a plant or animal. Over time, a domestic species becomes different from its wild relative.

Neolithic farmers selected for crops that harvested easily. Wild wheat, for instance, falls to the ground and shatters when it is ripe. Early humans bred for wheat that stayed on the stem for easier harvesting.

Around the same time that farmers were beginning to sow wheat in the Fertile Crescent, people in Asia started to grow rice and millet. Scientists have discovered archaeological remnants of Stone Age rice paddies in Chinese swamps dating back at least 7,700 years.

In Mexico, squash cultivation began about 10,000 years ago, while maize-like crops emerged around 9,000 years ago.

Livestock: The first livestock were domesticated from animals that Neolithic humans hunted for meat. Domestic pigs were bred from wild boars, for instance, while goats came from the Persian ibex. Domesticated animals made the hard, physical labor of farming possible while their milk and meat added variety to the human diet. They also carried infectious diseases: smallpox, influenza, and the measles all spread from domesticated animals to humans.

The first farm animals also included sheep and cattle. These originated in Mesopotamia between 10,000 and 13,000 years ago. Water buffalo and yak were domesticated shortly after in China, India and Tibet.

Draft animals including oxen, donkeys and camels appeared much later—around 4,000 B.C.—as humans developed trade routes for transporting goods.

The Neolithic Revolution led to masses of people establishing permanent settlements supported by farming and agriculture. It paved the way for the innovations of the ensuing Bronze Age and Iron Age, when advancements in creating tools for farming, wars and art swept the world and brought civilizations together through trade and conquest.