Firstly, why do you say dust is flatter than sand? Dust particles are usually modelled to be spherical or cylindrical in scientific studies, ie the same shape as sand and certainly not flatter.
How dust is modeled in scientific studies isn't really relevant to it's ability to penetrate a 'dust-resistant seal'. Neither dust nor sand are actually spherical or cylindrical, but in general dust is smaller and has a higher surface to volume ratio than sand. Here's some household dust:
Some of it could certainly be described as 'flatter than sand'.
LOL. My bad. I remember one of my early Macs had a default alert tone which I'll echo here: Sosumi.
SEM images are frequently colorized to make structers easier to visualize, although obviously no additional real information content is added by the colorization.
First of all, I won't require a second for the duel (ha! take that! 8)) and secondly, the picture of your own second appears to be obscured by that little dude in the wheelchair's laptop screen. Funny, I'm sure I met that bloke at CERN back in 2004...looks just like him (note: he cheats at rock, paper, scissors). Anyway, be sure to tell your second that's a nice white blouse she's got on.
Oh, and as for the Cambridge sense of humour? Footlights has so much to answer for.
Game, set and match, chummy.
(I'm sure the pair of us could go on like this all day but isn't it fun to hide behind a keyboard, no?)