What's the common denominator between your car and a speedo swimsuit (besides that you look really good in both)? The answer: your speed in both is impacted by FLUID DYNAMICS!
I'm no engineer, so please forgive my oversimplified post. A college friend (who actually IS an engineer) sent me an interesting article on fluid dynamics and fluid theory.
Basically, fluid theory has traditionally explained action in 2 dimensions. The new theory explains why fluids (including air) behave differently in three dimensions: MIT Discovers "Breakthrough of the Decade", Could Affect Everything From Cars to Golf. This could have great implications for improving fuel efficiency for your car (and your body).
Interesting, even if I don't completely understand fluids ;)