A good video explaining time dilation

Forestman
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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:

https://www.physicsforums.com/showthread.php?t=479180
 
One picture is worth a thousand words. I have no doubt that this video helped many people.
 
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?
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
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Thread 'Relativator (Circular Slide-Rule): Simulated with Desmos - Insight'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)... Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/ by @robphy
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Thread '1-Way Speed of Light'

Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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