Professor Tim Spector

And it's designed to have microbes in it.

that serve a crucial purpose in training our immune system to recognise what's harmful and what's beneficial.

And it's also shown to be crucial for our brain development.

But it is fascinating when we start thinking about our origins and think of it, you know,

We essentially start as microbes because also we don't think of our body – we've always historically thought of God's creation as body.

It had nothing to do with anything else.

We were the masters of the universe.

And it's quite humbling to realize that so much of us comes from microbes.

And I learned something recently that also blew me away is that all our cells have these –

powerhouses in them called mitochondria.

And it turns out they do much more than just supply batteries for the cell.

They're fighting inflammation.

They're important for gene expression.

They're good for metabolism.

And it turns out the origin of these things is little microbes that got trapped in our bodies.

They are essentially microbes that were good at making, creating energy

And at some point in our distant past, we fused our multicellular.

microbes that were going around doing stuff they said all we could do was some more energy and so by chance they fused with these energy microbes and slowly and slowly became incorporated into our bodies so that we now have these mitochondria all over our bodies which whose ancestors are also microbes and we have them in every cell of our body yes we do and they're turning out to be quite crucial as well in brain health

Well, I think as soon as you add life, whether it's plant life, I mean, you're thinking perhaps of animal life, but, you know, things like lichen on rocks were one of the first forms of life.

And something that was needed to get energy, nutrients from the rock, and then they...