Graham Barker of Australia is a navel gazer. Or rather, he is a navel fluff gazer, as he is perhaps the world's only self-proclaimed navel fluff enthusiast (and "God-fearing weather-geek") . Barker has been collecting and cataloguing the dirt and lint found in his navel for 20 years (his entire collection is pictured on the left), and he is also dedicated to the research and theory behind the development of belly button trappings. Barker has found that those with hairy stomachs develop more fluff since the hairs trap fibers from clothes more easily. He has also found that those with larger stomachs produce a greater quantity of fluff since larger stomachs have bigger and deeper navels. [Mental Floss]