The idea of Belly Dancers wearing a jewel in the navel originated in Hollywood. Real dancers in the Middle East don't put jewels in their navels.
Did you know that Jelly Belly were the first jelly beans into space. They got sent up in the Space Shuttle Challenger.
You get more Belly Button Lint (BBL) as you get older.
More men have BBL than women.
Lint colour reflects your skin tone - lint is lighter for light skinned people.
Skin type does not affect BBL.
BBL appears to be related to hairiness.
Too much belly hair, or too little belly hair somehow inhibits the movement of BBL into the belly button.