re: #555 filetandrelease

My understanding is that though relative it is also real, for instance, traveling at near the speed of light to the nearest start may take over 7 years for those of us here on earth, but for those on board it would be less than a year. Otherwise when they got back, we would age 14 years, they 2.
But then again, my understanding of these things is often confused.

Yup it’s very real. After traveling at great speeds your clock won’t match clocks when you get home. Steven Hawking gives a very clear and easily understood explanation in Brief History of Time. You shoud read it. It’s actually surprisingly easy to understand.