FoxNews brings us this scientific breakthrough:
Georg Steinhauser, a young, affable Austrian chemist, spent three years gazing at his own navel — and those of friends and family as well — to discover how exactly we get belly-button lint.
"Abdominal hair is mainly responsible for the accumulation of navel lint," proclaims Steinhauser in the abstract to his paper, presented in the online version of the journal Medical Hypotheses. "Therefore, this is a typically male phenomenon. The abdominal hair collects fibers from cotton shirts and directs them into the navel where they are compacted to a felt-like matter."
So now that we know how it forms, the next question is — why?