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ANSWERS: 4
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If they have a lot of hair around their navel and wear shirts with fuzzy inner lining (like sweatshirts), they will accumulate more. The hair acts like a brush, and the material is easily scraped. Less hair or a more resilient fabric will promote less accumulation.
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Some people have giant grape sized belly buttons who do nothing all day but eat potato chips in bed and wear nothing but yarny old sweatshirts. Also some people have a venus fly trap that gobbles up any loose yarn, dust, snackfood, gamma particles, hair, or paperclips and deposits them directly into the belly button. Still others have a black hole belly button that has an intense gravitational field that actually sucks small objects into the bottom of an endless pit - called the belly button singularity or BBS for short.
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Maybe they wear fuzzier shirts.... or they don't clean out their belly buttons as often, so they get more in the end because of that...
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It is genetic.
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