hello, I find both quantum mechanics and string theory to be a bit iffy. Mabey it's just because I don't understand it but I think the best way to understand the iffy stuff is to post it on here. Mentors might see this as a debate or going against mainstream physics but how are you able to make new discoveries without thinking of new ideas? Mabey I'll make that my signature. 1) D-0 branes don't exist yet they have infinite mass and energy. 2) strings also are 1 dimensional which means they don't exist relative to a 3 dimensional observer yet they hold energy and mass as well. 3) These 1 dimensional strings yet a mathematical impossibility can stretch without breaking. 4) In quantum mechanics it states that something may or may not exist until you look at it but aren't we indirectly observing everything in our "light cone" for example standing on a tight rope the tight rope "may or may not exist behind us until we look at it" but it does exist because if it didn't then it wouldn't be quantum mechanics anymore it would just be classical mechanics, haha get it! P.S. I won't be able to respond for a while because I'm going somewhere but hopefully in the mean time someone will be able to shed som light on these contradictions.