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Bobblehead - Strength is a miscellaneous item in Fallout 3, a Vault Boy bobblehead. It permanently improves the Lone Wanderer's Strength by 1, to a maximum of 10.
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.
The bobblehead in Simms' house
Collectable Strength bobblehead available from the Bethesda store.