In fact certain cosmic particles have exceeded the speed of light... in the earths atmosphere where the speed of light is marginally slower than in a vacuum. Ever heard of Cherenkov radiation?
The Sonic Boom of Light Speed? 
Also the largest nuke ever detonated on Earth by the old Soviets was not measured in kt but in Mt 50 of them to be exact. Most are kt due to reduced efficiency in larger explosions compared to smaller ones for military purposes. The largest bomb ever built again by the Soviets (same as the one they detonated actually) is 100Mt. If ever used to full effect it could increase global fallout from a nuclear war by 50% all by itself.
I love humans.
[ November 27, 2003, 03:46: Message edited by: Cyrien ]