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:
https://youtu.be/FdWMM6aXpYE

Could Flatland Be CURVED?!
https://youtu.be/WcCsELqZnE0
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RELATED YOUTUBE VIDEOS

PBS Space Time on Spacetime Diagrams:
https://youtu.be/P4rW_pPbD-U
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OTHER SOURCES

https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html
http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/spacetime/
https://preposterousuniverse.com/wp-content/uploads/2015/08/grtinypdf.pdf
https://physics.stackexchange.com/questions/21376/what-is-the-origin-of-the-naming-convention-for-position-functions
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LINKS TO COMMENTS

https://www.youtube.com/watch?v=WcCsELqZnE0&lc=Ugx4VcBiA1jkzK5sCxZ4AaABAg
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https://www.youtube.com/watch?v=WcCsELqZnE0&lc=UgwMxEQVjmNKTg7808Z4AaABAg
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IMAGE CREDITS

Gravitational Lensing:
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Gravitational Waves:
https://www.ligo.caltech.edu/video/ligo20160211v5

Black Hole Simulation:
https://svs.gsfc.nasa.gov/13326

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Видео What the HECK is Time?! (in Einstein’s Relativity) канала The Science Asylum