Proof Engine Verification: The adult human brain has approximately 86 billion neurons and an average of 7,000 synapses per neuron, resulting in a total synaptic count exceeding 6 × 10^14.

Verdict: PARTIALLY VERIFIED - **SC1 PROVED:** The adult human brain contains approximately 86 billion neurons, confirmed by two independent verified sources: Herculano-Houzel 2009 (peer-reviewed, PMC) and UCLA Brain Research Institute (B1, B2). - **SC2 NOT SUPPORTED (as stated):** The 7,000 synapses/neuron figure comes from research specifically on *neocortical* neurons (~20 billion of the 86 billion total). The primary source (BioNumbers/Drachman 2005, B3) explicitly states "20 billion neocortical neurons, with an average