"I have been called the staff of life. I have been eaten for ten thousand years. I start as a field of grain and end on every table in the world. What am I?"

Answer: Bread. Bread has been a staple food since the Neolithic period, about 10,000 years ago. It begins as wheat or other grains, is ground into flour, mixed with water and usually yeast, and baked. It is a fundamental food across virtually every human culture.