Proof Engine Verification (PROVED): The human brain accounts for 2% of body weight but uses 20% of the body's oxygen at rest.

Automated fact-verification of the claim: "The human brain accounts for 2% of body weight but uses 20% of the body's oxygen at rest." Verdict: PROVED Key Findings Two independent authoritative sources both report the brain as exactly 2% of adult body weight (SC1), matching the claim precisely. The same two sources both report the brain as exactly 20% of resting whole-body oxygen consumption (SC2), matching the claim precisely. PNAS citation (B1, B2) fully verified; NCBI Bookshelf weight citation (B3) fully verified; NCBI oxygen citation (B4) partially verified (60% word coverage — but SC2 is independently established by fully-verified B2). No counter-evidence found in any direction: the ~2% and ~20% figures are consistent across all neuroscience literature. Source: proof.py JSON summary Files proof.py — Re-runnable Python verification script proof.md — Structured proof report proof_audit.md — Full verification audit trail proof_narrative.md — Plain-language summary proof.json — Machine-readable structured data Generated by Proof Engine v0.10.0.