2 published verifications about human brain human brain ×
“More than 3,000 human genes show sex-specific expression patterns in the human brain.”
Recent high-quality research directly supports the 3,000+ figure: a 2025 single-cell study of the human cerebral cortex reports "over 3,000 unique genes" with sex-biased expression, and independent transcriptomic analyses corroborate counts in this range. However, the claim's unqualified framing omits important context — the number varies substantially by developmental stage (dropping to roughly 1,000 in the adult forebrain), brain region, and methodology, and cross-study consensus on which specific genes are sex-biased remains limited.
“The human brain uses 20% of the body's total oxygen supply.”
The claim is well-supported by multiple peer-reviewed biomedical studies confirming that the adult human brain consumes approximately 20% of the body's total oxygen at rest. This is a widely accepted figure in neuroscience. Minor caveats: the figure applies specifically to adults in a resting/basal state, some sources cite a 15–20% range, and the proportion is significantly higher in young children. These are standard qualifications that don't undermine the claim's core accuracy.