Can anyone help explain to me how the alternate timeline works? If the detination of the hydrogen bomb did bring about this alternate timeline, even though I don't believe it did, wouldn't everybody's lives just change after they got on the plane? Why would the detonation change their lives completly, as seen with Jack now having a son, Locke getting married to Helen and having a good relationship with his father, as well as Sayid no longer able to marry and be with Nadia forevever? If the detonation did cause this, it shouldn't have changed all of these character's lives like this. This makes me believe that the detonation didn't cause the alternate timeline. I believe that a future event in the show will cause this new timeline. Any thoughts?