I got hooked on the Bernoulli (#44), Fan operating against other fan (#38) (but realistically, I think I misunderstood the answers - same direction from your vantage point - not opposite direction being that one is turning cwise and one ccwise - it's like an air-powered torque converter)... and #31 - balancing non-centered fulcrums (growing up with a fat brother and a park with a see-saw, I should really have known about that earlier)

*shrugs* Pretty good, really.

Bren R.