Science Bobblehead

The Science bobblehead is a a Vault-Tec bobblehead in Fallout 4. When picked up it permanently gives you an extra guess when hacking terminals.

Location
Malden Middle School/Vault 75, on the desk overlooking the subterranean "Diner" combat test area, inside the vault building, basement level 3. You need to get the Vault 75 lab access card off the Gunner commander in the diner to get to this room. Essentially, just follow the Vault 75 side quest that starts when entering Vault 75.