A good video explaining time dilation

[Forestman]

http://www.youtube.com/watch?v=HHRK6ojWdtU

[ghwellsjr]

I don't like it. Video quality is great but it doesn't correctly explain what Einstein's theory is. It says that Einstein postulated that everyone would measure the same speed of light which is not what he said. Einstein affirmed that experiments had already shown that everyone measures the same speed of light but it is always a round-trip measurement of the average speed for both directions. What Einstein postulated is not something that can be measured and that is that the two halves of the round trip take the same amount of time. I already explained in detail this issue earlier today on this thread:

http://www.physicsforums.com/showthread.php?t=479180

[Forestman]

One picture is worth a thousand words. I have no doubt that this video helped many people.

[ghwellsjr]

Helped them do what? Learn an incorrect viewpoint of special relativity? Why can't they make a video that actually explains correctly what special relativity is all?