Cerenkov radiation is always a fun one! Screws with the mind does that stuff, took me ages to come to terms with the stuff...
Speed!

The fastest thing known to man is human thought. It's power and speed are infinite, and if not, it will invent the way to make it so, thereby proving the point.
All the discussion on partical theory is very interesting and one thing is definite, we are on the verge of wondrous discoveries which will catapult us into the next revolution of human ability. The next 20 years will be a most amazing time as the pace of technology accelerates with each new discovery. Think how much we didn't have 20 years ago and that's how many new things we'll have in the next ten years. And then again in the five years following that. And again twice that in half that time, until the speed of our technological achievement surpasses the speed of any known thing.
Ah, yes, what an exciting time to be alive.
me!