On Tuesday, 4 July 2017 20:34:28 UTC+2, Pentcho Valev  wrote:
> String theorists reject Einstein's spacetime but do not question the 
> underlying premise, Einstein's false constant-speed-of-light postulate 
> ("true premise, wrong consequence" is forbidden in logic but not in 
> Einstein's schizophrenic world):
> 
> 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 
This last sentence comes from a larger paragraph which reads:
The breakdown splashed front and center in string theory. 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.” Fields 
medalist Edward Witten also thought that space and time may be “doomed.” 
Nathan Seiberg of the Institute for Advanced Study at Princeton said, 
"I am almost certain that space and time are illusions. These are 
primitive notions that will be replaced by something more sophisticated."
The problem which this paragraph, and with the whole article, is that it 
gives not enough detail. It is an overview of opinions.
The first issue to understand is what means spacetime, space and time.
On purpose I do not write: what is etc.
To describe space we use a coordinate system. In principle space is empty.
The point x,y,z describe a point at a distance x,y,z from the origin 0,0,0
The time t is the duration t (or clicks) after we start a timer. 
To describe spacetime we use complex numbers x,ict
We define a complex line segment s = x + ict.
The length s^2 = l^2 - ct^2 or better s^2 = x^2 + y^2 + z^2 - ct^2
The problem? is that the line segment s nor that spacetime exists.
Spacetime is a mathematical construction. Space exist and time is 
something what humans experience. 
String theory is something (as far as I understand) more fundamental
than the standard model. It describes the building blocks of the quarcks?
The problem is that all of this has nothing(?) to do with space and time.
Nicolaas Vroom
http://users.pandora.be/nicvroom