Good Riddles

Question: one day there were 2 dads and 2 sons and 4 apples each persons gets an apple but there's one left over why

Question: In Africa, a baby was born - Are the baby's teeth black or white?

Question: Feathers, I am as light,
But quite heavy if squeezed tight.
I'm seen as clean and pure,
but often talked about with dirty terms.
What am I?

Question: A computer walks up to two stores, one called '1', and one called '0'. Which does it choose?

Question: Which is correct, 9 and 5 is 13 or 9 plus 5 is 13?