Avi Loeb

And that's called string theory.

Yes.

And they still do that, but they haven't made any specific comparison of their ideas to data, to experimental evidence.

They don't have such an experiment in mind that will test their theory.

And moreover, it's even worse.

They don't have a prediction that is unique.

And if we contradict it with experiments, the theory will be dead.

They don't have such thing because they have a theory that can basically explain anything that you find experimentally.

And so my complaint is, here is a mainstream community that was for 50 years working on extra dimensions and making a proposal for unifying quantum mechanics and gravity that will not be tested in the lifetime of the people who practice it.

So how can they call themselves physicists?

After all, the guillotine of experiments is...

the way of chopping the head of wrong ideas.

You know, we can think about an infinite number of wrong ideas.

Reality is a realization of one of them.

So you can think of physicists as

They're practicing the best way to narrow down the possibilities, just like a detective.

So you do experiments, you test ideas, and most of them are wrong because our imagination, especially the imagination of scriptwriters in Hollywood, science fiction scriptwriters, they have a huge imagination.

When people ask me, how would the alien look like?

I say, I don't know.

I mean, this imagination of the script writers in Hollywood was based on a training data set that was limited to this earth.