Brian Cox

So tell us, yes, that it is known as Dunbar's number.

So through neuroimaging of like Dave or Brian or Joe or me, would we be able to see how shallow our friendship was?

Or even if you have any.

So how does that scale?

So if you go to, I don't know, let's say a macaque or pick a species, then how does it change?

Does it change in a linear fashion?

They've made the great mistake there of assuming that the people I'm Facebook friends with are people I'm friends with.

What are the other forms of behaviour that we might expect to be different depending on the cognitive ability to have that many social connections?

I think I've just realised why S Club 7 split up.

Because each of them realised that only five of the others would pick them up when they were down and resented the other two.

Although I am assuming they were all capable of serious cognition, so maybe that's not right.

How much does that affect, say, the Osmonds?

Because there also you've got an actual genetic link as well, which would probably change the relationship, wouldn't it?

Well, how much does it affect all family bonds if only five people are allowed in that inner circle?

The minute you've got a six-person family...

Someone's in trouble.

The way we've talked about it so far is quite mathematical, it seems to me.

But when we talk about, of course, human relationships, there's a large amount of choice involved.

So I suppose I'm asking questions like, is there a pin-up monkey, is there a handsome monkey that everyone would go for?

Why are you bringing up, is there a pin-up handsome monkey, Brian?