What the HECK is Time?! (in Einstein’s Relativity)

In special and general relativity, we imagine time as just another dimension of space in something called "spacetime." Unfortunately, this picture leads to questions about determinism and free will. Is that really how it works? What does the concept of spacetime actually say about the universe and about time?
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VIDEO ANNOTATIONS/CARDS

The Ultimate Guide to Relativity:
The Ultimate Guide to Space-time and ...

Could Flatland Be CURVED?!
Could Flatland Be CURVED?!
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RELATED YOUTUBE VIDEOS

PBS Space Time on Spacetime Diagrams:
Can You Trust Your Eyes in Spacetime?
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Could Flatland Be CURVED?!
Could Flatland Be CURVED?!
Could Flatland Be CURVED?!
Could Flatland Be CURVED?!
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