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[–] 146Dissident_Fulcrum ago 

Damn. That is one penetrative particle. Does it just not interact with matter?

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[–] Devilbiter ago 

I think it only interacts via the weak force, so in general its cross section is much smaller than other particles that interact via the strong or electromagnetic forces.

In a related note, we had t-shirts in udergrad that said "Four forces in four years? This'll be easy." Heh.