marvel.wikia.com

d8ZwQ TIL that there is a Spiderman comic (The Amazing Spiderman #36) that deals with Spiderman being too late to stop 9/11. Spiderman along with four of his arch rivals help out at the scene of the attack by lifting rubble and rescuing survivors.
YpaXv TIL that there are Spider-Man comics (Spider-Man: Reign) where Mary Jane Watson has died from prolonged exposure to Peter's radioactive semen.
LkXBP TIL that Santa Claus in the Marvel Universe is the most powerful mutant ever detected by Cerebro