Toleman, please don't think i'm being pedantic or picking (no punn intended) a fight, but the length of the finger having the influence on speed of nail growth is correct except for the index fingers. They grow more quickly than middle fingers.
A polar bear's hair isn't white, it's transparent.
Each strand is actually comprised of two shafts of hair, one inside the other. The sunlight shining off the inner shaft is what gives their hair its white appearance.