成日有個錯覺，屋企好大塵，要日日係咁吸塵。不過唔知點解呢幾日無乜風，無乜打開窗，但屋企都仲係咁多塵嘅？因為個兇手，其實就係住喺屋入面嗰個你！
有無聽過一個都市傳聞，話城市入面嘅塵埃有8成都係來自人類嘅皮屑呢？其實無錯嫁，喺我哋生活嘅環境入面，塵埃主要係由我地嘅皮屑同埋衣物嘅毛髮，再加上以佢地為食糧嘅塵蟎、塵蟎嘅屍體同埋排洩物所組成。咁點解淨係人類嘅錯，其他動物就無頭皮嘅？其實原本呢，皮屑一般都會黏住毛髮掉落，無咁容易畀風吹起，可惜我哋喺演進嘅過程就愈嚟愈少毛，再加上有脫毛嘅習慣，所以啲皮屑就好容易吹到周圍都係。
塵就一直喺度，不過點解呢幾日一轉冷，地下嘅灰塵好似吸完又有咁？呢個係同空氣嘅流動有關。熱空氣嘅體積會膨長，密度細而向上升，所以塵埃比較唔容易著地。相反，冷空氣會因為密度比較高而下降，所以喺突然轉冷嘅日子，咁就會帶埋啲原本飄緊嘅塵埃不斷往下沉啦。另外，冬天皮膚變得乾燥，皮屑更容易掉落，啲羊毛冬天衫又特別容易甩毛，都會係塵埃變得多嘅原因。同時間，濕度高都會令塵埃變重而升唔起，所以呢幾日轉完冷又回暖變濕，就搞到一屋都係塵啦。
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