• A Science paper (DOI: 10.1126/science.abb2401) reports that inserting the human-specific gene ARHGAP11B into marmoset embryos produced a 45 % increase in neocortical neurons and a 3-fold rise in glial cells; the pregnancies were terminated at day 101 for ethical reasons, leaving behavioral outcomes unknown.  
• Participants debated whether the 45 % neuron gain is an underestimate because non-human primate mothers and fetuses are typically limited by essential long-chain fatty-acid availability, a metabolic bottleneck that could be engineered away.  
• Discussion linked two resources on maternal EFA status and human brain evolution: Will Lassek’s 2013 Ancestral Health Symposium slides and talk “Why Women Need Fat: Three Evolutionary Puzzles.”  
• The channel weighed the ethics of encouraging such experiments in permissive jurisdictions versus driving them underground; one comment warned that “super-marmosets” would be “genocided” for threatening human employment.  
• A side thread reviewed modest IQ gains (≈7.7 points) from maternal seafood consumption, noting that coastal populations with high fish intake do not exhibit dramatic cognitive superiority.