The pathway from raw prebiotic chemistry to a technological, communicating intelligence is staggeringly contingent. At nearly every stage — the emergence of self-replicating chemistry, the fixation of homochirality, the endosymbiotic event making complex cells possible, and the multi-billion-year climb to abstract reasoning — the outcome depended on narrow chemical windows and low-probability historical accidents. The deeper we look into the core machinery of life, the more reasonable it becomes to conclude that technological intelligence is a genuinely rare outcome in the universe rather than an inevitable one.
New companion essay: Rarity Through Constraint extends the same rarity-of-intelligence thesis from prebiotic chemistry into consciousness itself — arguing, via Michael Graziano's Attention Schema Theory, that subjective experience is a rare, constraint-driven engineering solution rather than an inevitable byproduct of computational scale, with direct implications for artificial minds.