Dr Karl

No.

I still haven't got a good way of remembering the 0439.

Four is a square and three then leads to three squared, which is nine.

Kind of weak.

Getting closer.

We'll get something.

We all have different ways of trying to work out little hooks.

And memory is one of these weird things that actually defines who you are because without your memories, you're no longer you.

And this can be very distressing for people who are relatives with people with Alzheimer's disease where they suddenly don't recognise their daughter or son.

That's scary.

Okay, onwards.

Ah, there's a whole bunch of articles on that in the Scientific American, and you can download them for free online.

Scientific American.

And what we see is a whole bunch of, and they've done MRI scans and functional MRI scans, we see flooding of waves of electrical activity and metabolic activity across the brain.

But going from that to saying, oh, you're taking this sort of hallucinogenic or that, we haven't been able to do that.

And also working out why you've got this sudden insight that the universe smells of turpentine.

And why would that insight come flooding into your brain?

You know, you don't know.

So we definitely do not know what they do to your brain.

They have been thought to be able to help in some cases of PTSD, and that's post-traumatic stress disorder.