Wasn't the 'dust is mostly dead skin cells' idea debunked?

Wikipedia is a little light on the exact source, but they make the claim that the 25 hour study was flawed, in that it allowed artificial light. If I'm to believe their references, a better estimate for human circadian rhythm is 24h11m. And it varies by gender.

I remember once sitting behind a mother and her toddler on the light rail train, and she was completely, blissfully unaware of that kid was doing. She thought he was looking out the window. Maybe he was, but he seemed most focused on licking every part of that window. Ewwwwww....