Time Vary.. Amazing

Time can vary?

Today when i was working i keep on staring at the clock... I realised the time seems to be moving very slow so i asked yu cheng.. "yu, Don't u think the time is travelling very slow?".. He agreed with me because i know all of us are very tired n sleepy.. Then I was asking myself 1 stupid question "It is possible that time varies at different time, provided we dont take into account how someone feels about it themselves(if not it's not logical anymore)" Then i asked yu cheng this question .. he paused and say "Yah, i read about this topic before but i'm not very sure why", "it's estein who come out with this equation E=mc2... He briefly explained lah.. then i just reached home and do some brief research... very tired sia

Check this out!
Now let's say you want to do some time travelling. You board a spaceship and take off for deep space.The ship approaches the speed of light. Time for you seems to pass as it always has. It takes you about five seconds to tie your shoe. But to an observer on Earth (assuming he or she could watch you), you are moving at a snail's pace. It takes hours to tie your shoe. Anyway, you continue on your journey. You slow down, stop, and accelerate back to Earth. You arrive home. You have aged two years during your flight. Two hundred years have passed on Earth. You have successfully travelled forward through time. But, Sorry. According to relativity, you can only move through time in one direction.

Actually if i'm not wrong jian bin share with me this before but i dont really get him.. But now i rather do understand, after doing some research.. lol... This is absolutely cool and i dont even know until now!... But i still think it's too true to be real.. See!, u can actually make yourself the same age as your father or whoever u like.. cool ? haha.. But one thing is that , you only can go to the future but not the past.. Because it can only slows down your ageing process but not turbo your ageing process.. Who wants to be an old man when he arrives on earth.. haha.. What we want to see is the instant effect on the things happening around you.. Get it.. Still so unbelieveable..

Those who think that this kind of logic can allow you to do some things you want to but can't .. You are welcomed to share with with the rest... Thanks.. And who got better evidence about this theory please share.. thank you!