Brains

'Brains' is a Stat that affects various skills requiring you to be 'smart'.
Medic, Hack and Repair rely solely on Brains, checking no other stat.
The Brains stat is also used feint in combat. When your Brains stat falls below a certain point you will get a filter which will make you sound like the retard you are.

Skills that depend on Brains

Medic
Locksmith
Hack
Craft
Appraise
Bombs
Repair
Pilot