One Liners: Knock Knock/who's there/OJ/OJ who?

Questions

between 25% to 33% of the population ---------- when they are exposed to light?

---------- is such a good stain that native americans used it for a paint?

blood is such a good stain that native americans used it for a----------?

---------- eyes are the most sensitive to light, dark brown the least sensitive?

blue eyes are the most sensitive to light, ---------- the least sensitive?