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The Ādam Paradox Hypothesis 189
Geographic Synchrony.
After ~70kya, symbolic artifacts spread across Africa and Eurasia rapidly,
consistent with a single ignition and expansion, not parallel independent
inventions.
Likelihood under APH: 80%–90%.
Likelihood under Gradualism: <5% (gradual buildup should yield scattered,
overlapping traditions).
3. Demographic Predictions
Bottleneck, Then Expansion.
Genomics shows effective population size ( Ne) <10,000 between 100–
70kya (Henn et al., 2012). APH predicts that this bottleneck aligns with the
ready-genome phase (ṣalṣāl).
Logistic Growth Model:
Post-70kya, to marks ignition, K rises (carrying capacity expands with cognition).
Archaeology confirms sudden expansions/migrations around this time.
Between 100k–70k years ago, humanity was tiny — fewer than 10,000 people,
barely surviving. APH sees this as the “ready-genome” phase: bodies were
prepared, but cognition had not yet fully switched on.
After ~70kya, cognition ignited — humans gained language, cooperation,
innovation, and shared identity. These new abilities boosted survival, allowed
large-scale cooperation, and unlocked migrations. Populations suddenly
expanded across Africa and beyond.
APH: Growth exploded because cognition ignited (~85–90% likely).
Gradualism: Growth should have happened earlier, just following climate
shifts (<15%)