When the September 11th attack took place, it didn't bother me at all. I figured that within a week it would all go away and we'd never know it had even happened. But then I heard that "7 Days" had been cancelled by UPN, and I knew our goose was cooked.
I'm still working on a fully functional lightsabre. Imagine a device that emits positrons on a controlled beam. Everything it touched that was surrounded by electrons (All matter) would sheer away, it would emit no heat until it touched matter, and it wouldn't go through another beam.
Seriously, though. If the rescuers had a few of these at WTC, there might have been more survivors: the wreckage would be cleared faster.