LIGO's gravitational waves are ripples in spacetime which doesn't exist:
Nima Arkani-Hamed (06:09): "Almost all of us believe that space-time doesn't really exist, space-time is doomed and has to be replaced by some more primitive building blocks."
https://www.youtube.com/watch?v=U47kyV4TMnE
Nobel Laureate David Gross observed, "Everyone in string theory is convinced...that spacetime is doomed. But we don't know what it's replaced by."
https://www.edge.org/response-detail/26563
What scientific idea is ready for retirement? Steve Giddings: "Spacetime. Physics has always been regarded as playing out on an underlying stage of space and time. Special relativity joined these into spacetime... [...] The apparent need to retire classical spacetime as a fundamental concept is profound..."
https://www.edge.org/response-detail/25477
http://negrjp.fotoblog.uol.com.br/im...0819051851.jpg
Pentcho Valev