If you have been living with your head firmly buried in the sand or under some kind of rock -- and if you're a San Francisco 49ers fan, that's a distinct possibility at this point -- then I'll tell you that 49ers starting right tackle Anthony Davis announced his retirement from the NFL on Friday.
Davis said that he needs to give his body and mind a chance to heal, and while this isn't exactly common for 25-year-old starters, it's not that strange. Though few high-profile players have left the game due to any kind of health concern, it's also not strange.