Archaeological discoveries show that the main cereals, including wheat, barley, rice and maize all originated 10,000 to 8,000 years ago.Actually, that's not true. Multirow barley (the cultivated kind) goes back at least 14,000 years (non-calibrated RC date, so the actual figure is higher).
History news from China recently makes them sound like they're up to their old tricks again. Everything is earliest this, oldest that and the first of the other.