We're in the market for a kid carrying ebike, and while REI makes the most financial sense, I think we'll be paying a visit to our LBS.
As an aside, I tend to prefer Sports Basement. Have had better luck with their bike department, too. No idea if they're better from a corporate standpoint though.
Dipoles are, effectively, not
so if you have a charged bit and another opposite charged bit, while an inverse relationship might exist between either one, the net effect is that it drops off much faster.
The thing with gravity is it tends to go one way, unlike, say, charge.