Science
This chap will give you an extra go when you're hacking terminals. So now you'll have five guesses instead of four.
Vault 75 is to the east of Concord, beneath Malden Middleschool.
You'll find the entrance in the destroyed section of the school.
Head to the lowest level to find the assault course and the gunner holding the Lab Access card.
Head back to the main floor and use the card on the locked door. Follow the stairs up to the next level.
Go straight ahead and through to the room at the end.
The bobblehead is on the desk overlooking the assault course. You'll find the Admin Access card on the body of the raiders here after you kill them.