Shortly after not only travel through time, but also between worlds was discovered in the 26th Century, it was surmised that certain events could be changed without damage to the timeline. Instead just creating a parallel reality. With some experimentation, this was proven. Time Can Be Changed
I think I've finally got the hang of this being stronger thing. I haven't broken anything since yesterday. Only thing I am still finding really weird is the not really getting tired thing. I miss sleep.