Logan's skull
Was Logan's skull also injected with adamantium?
In X-2, Logan (Wolverine) got shot in the forehead but the bullet didn't penetrate his skull. If it was organic (bone), Logan would die.
Two problems i have with this however:
1. How was adamantium injected into Logan's skull without demaging his brain?
2. An adamantium skull is very heavy. How does Wolverine's brain edure the weight?
Logan's chemistry must be extraordinarily different than an ordinary human. Otherwise he would not have survived the injection.