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Hello and welcome to the History Extra podcast from BBC History Magazine, Britain's best-selling history magazine.

I'm Ellie Corthorne.

In today's Everything You Wanted to Know episode,

we're bringing you more on Britain's most famous prehistoric monument, Stonehenge.

This episode is the second part of a two-part special on Stonehenge. So if you haven't heard

part one, I'd recommend pausing this podcast now and going back to last Sunday and checking out

the first part. But if you are up to date and keen for more, then in this episode, our content

director, David Musgrove, put more of your top questions and internet searches about

Stonehenge to the archaeologist and author Mike Pitts. Carl O'Doherty would love to get an

overview of the construction he asked. And he talks about specifically the maths and measurements

needed, which is an interesting turn of phrase, isn't it? Maths and measurements. What does that tell us about? I mean, presumably, you know, they weren't using maths in the same way that we are today, or were they? Well, I mean, not in the same way, but they must have been using maths. I mean, they must have had a counting system. One of the obvious things at Stonehenge, I mean, is the original Stone Circle has 56 stones in it.

56 doesn't sound very special to us today.

But the final Stonehenge has a lot of tens and fives in it.

You've got 30 stones in the circle, 30 lintels.

You've got five trinathons in the middle and so on, which gives you 10 uprights. And you can see those

fives and tens reflected in timber structures as well at the time. So clearly they could count.

And to be honest, you're not going to be able to build something like Stonehenge with all

the complex engineering if you can't count. And presumably they had also

a system of measurement. Again, you need to measure stuff somehow to get all these things to fit

together. There have been a lot of attempts to prove the existence of a unit of measurement and to try

...