What are some random facts you've learnt thanks to the podcast?

I've learned so much from this series, except most of it is so obscure or random I will never volunteer it except in very specific situations. For me, some examples include the context behind the relief of Mafeking, the seating capacity at the 02 (millennium dome building) and the tragic and grizzly context behind the saying Sweet Fanny Adams.

What have you learnt thanks to the show?