Nerd alert! There they go, the lot of 'em, whizzzzzzing past the traditional pedestrian pace with their little helmets and big wheels. And they're always in a cluster! The tech is so new, and the first impression so much a head-turner that they are wise to honor the instinct to travel in packs. (We could imagine the too-cool-for-school scooter crowd wanting to slap them silly.) But you can't really accuse them of herd mentality. What they are riding stands out like a fuel-injected funny car at the Belmont Stakes. Ahhhhh, the brave and noble self-balancing eco-friendly Segwayers: Tourists, newbies, the curious, pioneers, all, seeing our town from a new vantage point on two wheels, standing tall.