[ WP ] Your colleague is the first physicist to successfully open a wormhole that is capable of transporting things into the past to the point just before the hole was opened . Your colleague passes through and then shoots himself in the head .

The crack rang loud. The man crossed the threshold back into the reality that he had come from. 
 
 `` I did it! I solved the grandfather paradox.'' 
 
 `` No you did n't.'' 
 
 The man frowned at his assistant. `` I killed my past self! But I'm still here! It means the time bastard theory is true. Time travelers are immune!'' 
 
 The assistant shrugged. `` Did you shoot me?'' 
 
 `` What?'' 
 
 `` Shitty experiment. If you shot me you could have seen if I, not a traveler, was also immune. Now we do n't know. Besides it could be multiple universes. But we do n't know. We pumped so much energy into the device we could have created another, isolated universe.'' 
 
 
 The main scientist was getting annoyed. `` So you're telling me that I just sacrificed the sun, and therefore the world. And I proved nothing?'' 
 
 
 `` Yup.'' 
 
 `` Any reason you did n't want to share this earlier? I was busy building the device, it was your job to prepare the tests.'' 
 
 The assistant shrugged. `` Maybe if you actually paid me I could have told you sooner. Or you know, you googled a philosophy class. Oh well.'' 
 

