The irony is that if he completely accepted the fact that certainty doesn't exist, he would create the certainty he craves: he would be absolutely certain that certainty doesn't exist.
It is not possible to determine whether both continents are moving in opposite directions or whether one continent is stationary and the other is drifting away from it.
There was still an annoying popup confirmation dialog box, but with my mouse hovering over the "x", and a finger on the Enter key, I could do it quickly.
Even though I was certain that the yield on the X-ray would be small, I wanted to be able to tell her we had turned over every stone in search of the cause of Jerry's nonproblem.