Bobblehead - Strength is a Fallout 3 item, a Vault Boy Bobblehead. It permanently improves your character's Strength by 1, to a maximum of 10.
Location
The bobblehead is found in Lucas Simms' house in Megaton, on a desk in the bedroom (door to immediate left at top of stairs) on the second floor. Don't break in; wait until the door is unlocked.
Notes
If Megaton is destroyed during the The Power of the Atom, this item will be unobtainable.