Male voice, mid-30s, warm, calm, and friendly. Clear and natural storytelling tone with a slight sense of curiosity and wonder. The delivery should feel conversational and human, like a knowledgeable narrator explaining something fascinating to a friend. Moderate pacing — not slow, not rushed — with natural pauses where the text suggests them. Gentle emphasis on surprising or emotional moments, but never dramatic or theatrical. The voice should sound trustworthy, relaxed, and engaging, similar to a documentary narrator but slightly more casual and YouTube-friendly. Avoid monotone delivery. Allow subtle variation in pitch and rhythm so the narration feels alive and natural.