1. To Activate the Sharingan the Uchiha must undergo strong emotional condition(like getting really angry and all).
2. Kishimoto stated in the third databook that if a Sharingan user and a Byakugan user were to mate, their offspring would have one Byakugan and one Sharingan.
3.Sharingan is translated to Copy Wheel Eye.
4.Sasuke Cannot use Kamui!
5.Mangekyo Sharingan can cause Blindness. Since the day it is activated the user starts becoming blind! The more the use the faster the user becomes blind!
Here were the 5 facts about sharingan….(byaku-sharingan LOL)