What Is Spacetime, Really?—Stephen Wolfram Blog
blog.stephenwolfram.com/2015/12/what-is-spacetime-really
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
hundred years ago today Albert Einstein published his General Theory of Relativity—a brilliant, elegant theory that has survived a century, and provides the only successful way we have of describing spacetime.