not bad

not bad but we don't reely know what the 4th dimenshion is we think it is time. "Time is but an illusion" some1 sed and i beleave them because how can sunthing that changes so often be a measherment of anythang. if you were to leve earth a day wold be near anywere from 12 to 54 hours earth time it can be even shorter or longer pending on point in the unaverse. "after leveing earth ageing slows... basicly time travel" if u reely think about it u were just time traveling and still are.

ok in short time may or may not be the 4th dimenshion and time travel das already ocurd and is still hapening

wonderfully informative!

most of this information I already knew, but you did a wonderful job of simplifying it to make it easy to understand. As a person who loves science, I say 5/5, 10/10.

Physics....drooooool....

Yeah, a valiant effort, but I think this falls a bit short. Anyone who would be even interested in this would probably already know about this explanation of gravity. If anyone is interested, search on google videos for the 3 episodes of Nova on string theory. THAT is truly awesome, and entertaining, physics stuff.

Very interesting.

I love learning about space, time, and the theory of relativity. This is a good "in a nutshell" explanation of Einstein's theory, and hopefully it'll spark someone else's interest in the subject as well.

I think that making a "next" and "back" button would be more appropriate, it would allow people to move back and forth at their own leisure and allow them to learn at their own pace. I think that the time intervals were pretty good between each paragraph, but it does rush things in a way.

Apart from that minor gripe, good job :)

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you was sertenly high when you did this. its all smart things but you didnt even invent that theory about time beeing the fourth dimension. anyway the way you explain it is really pushed and thats why its good. you just maybe have time to loose thinking about that. life is too short