A split-screen timeline-style YouTube thumbnail. Left side: a dark, primitive fire pit with a burnt flatbread on a stone, labeled "14,000 YEARS AGO" in small white text. Right side: a modern golden artisan sourdough loaf with steam rising, labeled "TODAY" in small white text. A glowing line or arrow connects both sides across the center. In the center background, faint silhouettes of Egyptian pyramids, Roman aqueducts, and a medieval bakery. Warm golden and earthy brown tones. Text at the top says "COMPLETE HISTORY" in bold white. Text at the bottom says "14,000 YEARS" in larger bold gold. Cinematic, epic documentary style, 4K, YouTube thumbnail aspect ratio 1280x720.