The Paradox Factor

"...is it small enough that it won't matter?", you think to yourself as you look at the computer screen.

The screen reads:

Simulation: Lab explosion.
Paradox factor: 0.0000431%

No, you decide. It must be zero.

You try another simulation, the screen reads.

Simulation: Jimmy drowns at 5 years old.
Paradox factor: 0.0000023%

You rub your temples, your headache is really bad today. You hate the idea, but decide that you have to try it.

Simulation: Five scientists removed from project.
Paradox factor: 0.0000000%

"No, there must be another way.", you say to yourself as you rub your temples, your headache has returned.