Brian Greene: The universe on a string

String theory is really a lot of hot air....we cant measure things perfectly in our dimension... and for the holes in our understanding we invent new dimesions... and then new universes... nice ;-)

Good and informative video, but what do you mean by "This mind-bending theory may soon be put to the test at the Large Hadron Collider in Geneva"? I was told by a physicist who works on superstring theory in CERN that in order to prod energy scales large enough to experimentally test superstring theory would require, with present knowledge, a particle accelerator so large that it couldn't even fit on Earth... I don't think we'll be able to test it very soon.

And I forgot to mention, that's why the physicist in question didn't really have a lot to do with LHC although it too is situated in CERN. LHC is mainly used to test the Standard Model of particle physics, and string theories go way beyond the Standard Model.

He says there might be 10 extra dimentions, but he only explain the tiny curled up ones, and they seem to be in infinate numbers. Are they counted as one extra catagory of dimention because they have the same traits, or are there diffenent types of curled up dimentions?

String Theory ?

It began in 1907 when Minkowski tried to understand
SRT using 4D space
Nobody knows what Minkowski negative space really is
Trying to understand it, Kaluza in 1921 created 5D space
Nobody knows what it is too
So
If we don't know what 1+1 = 2
how can we know what 5 + 4 = 9 ?

And if we don't know what is 4-D how can we
understand SRT and another 10-D, 11-D/ String Theory ?

It's 42, very well explained btw

Beautiful explanation....

Excellent, well done explanation..

Well, yes, and that is why Peer Review is so important. When the people that decide if your work get's published is often your biggest competitors you have to work really hard to make sure that you really can back up your position.

Now, of course it does happen that conclusions that are "wrong" do end up published. That's part of the whole endeavour. Newtonian physics is "wrong", demonstrably, but it is "close enough" that it works.

And that's the important thing in science - if it works.

@EtherealN It's reassuring to know you keep and eye on each other. I guess my concern is as simple as the world's banks dragging the economy down the toilet. I am getting old and cynical and do not trust "experts".