It is good that you question. I had the same problems with quantum mechanics. I was sure that scientists were just copping out and a classical explanation was too hard for them to come up with. But then I realized that the double slit experiment exhibited behavior that cannot be explained with classical mechanics. You must question, but you must be willing also to change your answers when the data shows you up.
Both of Einstein's theories are nothing more than him working out the consequences of certain bizarre facts about the universe. Special Relativity is the simplest to understand, so I'll explain that here.
Special Relativity: Light Is A Constant
The bizarre fact that makes Special Relativity possible is that no apparently, no matter how fast they are going or who is looking at it, light always looks to be going the same speed to everybody. (This speed varies depending on what it is traveling through, but it looks the same to everyone.) We guessed this first in unproven mathematical theories, and then finally found out it was true through experiment--particularly the Michelson-Moreley experiment.
An Analogy: The Biker-Ball Universe
The reason this is so bizarre can be best demonstrated by analogy. Let's pretend there's a universe in which you can throw a ball of light at someone. And let's further pretend that light in that universe goes 60 KPH.
Now, let's say you're sitting on the ground having a nice picnic (you're moving at 0 KPH), and a Hell's Angel biker comes tearing across the grass towards you at 30 KPH. In reflex, you throw your ball of light at him.
Now the light is going away from you at 60 MPH, because that's the speed of light. And if this were an ordinary universe, the Hell's Angel would be scared as heck because it would look to him like the light was coming at him at 90 KPH (30 KPH + 60 KPH). Kind of like when two cars going 60 KPH hit each other head on we say they crashed at 120 KPH, because that's how fast they were going relative to each other.
But this is no ordinary ball, and no ordinary universe. This universe has our weird rule that says light has to look the same to everyone.
So because of that rule, you should see the light going away from you at 60 KPH and he should see the light coming towards him at 60 KPH, even though he's moving toward you really fast. How bizarre!
Why Space Time Has To Bend
The problem is, now that light is all screwed up, the biker and you are going to perceive the place where the light hits you totally differently. He will see it hit him when you two are 30 feet apart, and you will see it hit him when you are 40 feet apart.
Thus something has to give. The only two things there are in velocity are space and time (distance divided by time). So something has to bend in order for everything to work out. It turns out that both of them bend.
If you're 60 feet from him, and he's going 30 KPH, then you'd expect the light to hit him at 40 feet from you (the light traveled 2/3 the distance and he traveled 1/3). But from his point of view, the light is coming at him at 60 KPH and you are essentially coming closer at 30 KPH (just flip around how you see things, there's no difference in terms of the math). When the light hits him it will have traveled 60 feet and you will be 30 feet closer. So to the biker, it looks like the light hit him at 30 feet from you.
That number has to match up somehow or the universe would be screwed up: you could never say "X happened at time and place Y" because that time and place would be totally different for everyone. Since the velocity of light can't bend, something else has to. It turns out that what bends is space and time around the observer.
Hope this helps some and I haven't confused you more :)
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