Does Time Exist? Science Explains 4 Dimensions & Timelines

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I hope that you don't think this question too stupid to answer but I have a narrow question about time.
It is often said an atomic clock on a airplane or GPS has different time than on land or that if properly protected a clock going into a black hole will stop because of the speed of light or because of gravity. My question is: Isn't an Atomic Clock or any clock just either a mechanical or vibration that happens by design to coincide with the calculated time on earth? In other words someone designed a device that happens to tell time as we know it. It doesn't sense cosmic time. So if properly protected wouldn't it "tick" or Vibrate the same as it does on earth. Or let's say someones heartbeat just happens to be so accurate that you can tell time by it. If he is adequately protected and goes into a black hole won't his heart beat the same? By the same token I can buy a clock that ticks slower or faster than actual time because it is a bad clock, it has nothing to do with actual time. So how can we make the assumption that time slows?
 
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Nope. Time actually does change depending on where you are in a gravity well and when viewing things moving at different velocities relative to you. I'll try to explain better once I get my internet set up and I'm off my cell phone.
 
to me time is just another dimension in which any object keeps on sliding at the speed of light, just like a ball placed on a child's slide. The only way for the ball to stop/slow sliding down is start moving in another direction.