I am a newbie to quantum physics but have been actively reading much about it for a couple weeks. However there are a few questions I simply cannot seem to find the answer to in regards to time dialation, the relationship between speed of light and time, etc. It seems like many sources repeat the same things over and over, with little proof that I can find as to why we believe them. I hope someone can help answer some or all of these things. 1) What exactly made Einstein correlate the speed of light with the speed of time? What data did he have, or what evidence was out there to link these seemingly unrelated things? What made him think moving fast would change time? I'm aware of the light clock example, but this seems more like theory regarding a matter of visual perspective than something that could change the speed of a human aging. 2) How could light possibly be the same speed for all observers? What a relatively stationary person fired a laser alongside a very fast moving person, and they both observed the same laser? If they both observed it at light speed, they would both be seeing the same laser in 2 completely separate places. What evidence is there to even make Einstein or anyone believe this is true? 3) Even assuming the above is true, and the speed of light is the same for all observers, just how is that supposed to be correlated to actual "time"? Just because 2 people see something differently, like an optical illusion, I hardly see how a difference in perception of light, equates to an actual difference in the speed of passing time. 4) What real proof is there of time dilation? Yes I have heard certain particles decay slower when moving fast, or that a caesium clock, or other clocks, reporting time a little different, but I hardly see how this is proof that "time" itself is changing for the clock. In fact, from what I had read about the Hafle Keating experiment, it may have disproved this, as clocks moving in opposite directions gained and lost time, which is inconsistent with the theory that a faster moving object slows down time. If that was true, both moving clocks would slowed at the same rate. This seems to indicate that even if moving clocks do experience an unexplained change in time, that there is some other force at play besides time itself changing. 5) A related example - You could take a falling sand clock higher where the pull of gravity is less so the sand falls slower, or you could put magnetic fields next to a grandfather clock to change the speed of the pendulum. Just because some force (even if it is not yet known) changes the speed a clock works at, does not mean the clock is actually experiencing time differently. And just because a certain particle deteriorates slower when moving fast, I hardly see how that is a strong indication that actual time has changed for it, nor that this phenomenon could possibly scale to the level of the twin theory where one human would age faster than another. I want to have an open mind, I'm not trying to just argue, and admit I'm new to this realm with much to learn. I'm just not seeing where there is any proof or real evidence of these widely believed and highly unusual theories of changing time. Any input?