We ran the numbers and if you NepTUNE in this week and you can bet Uranus that you'll have a good time. We're learning about mathematician, astronomer and 10 pound note model Mary Somerville from actor, musician, friend-of-the-pod and 'Honorary Scot': Tyler Collins.

Grab your prams and practice your Les Mis because this week we're building a barricade--except instead of Marius we're talking about Mary Barbour…

Did the Picts have it all figured out? Where did Hadrian learn to build walls? When will Nat reference another Doctor Who episode?…