'We all move at speed of light through spacetime'.. What does it really mean?

Описание к видео 'We all move at speed of light through spacetime'.. What does it really mean?

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We all travel through space time at speed of light. But, what does it really mean? How does it explain the consequences of special relativity - time dilation, length contraction, relativity of simultaneity, and more.

Chapters:
00:00 Intro
01:25 A 2D analogy
04:15 How to validate?
07:08 How Pythagorus helps
08:40 How to piece a website (Ad)
10:15 Speed in 4D spacetime
13:30 Why length contracts along motion
16:30 Simultaneity & clock desynchronisation
18:17 Revising the Twin's 'paradox'
19:36 Why 3 spacial dimensions & 1 time dimension?

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