Websites, videos, images and other places where the facts for the show came from
Friday 20 May, 23:05, BBC Two
Yeoman search the Houses of Parliament's cellars for gunpowder before the State Opening of Parliament each year.
An MP is taken hostage once a year during the State Opening of Parliament. Jim Fitzpatrick reminisces about being the 2014 hostage here.
Fights sometimes break out in Ukraine's parliament - like this one in December 2015:
The ISS has quadruple glazed windows. The fleck of paint that hit the ISS and cracked its window was about 1/1000 of a mm - the same size as the head of a human sperm.
But apparently a didgeridoo is necessary:
Dan, James, Anna and Andy discuss see-through wood, artificial wine, and the Queen's adventure in a lift.
According to the former head of Russia's anti-doping laboratory, male Russian athletes take their drugs with martini, while female ones take them with whisky. Here's the full interview with Grigory Rodchenkov.
Students at the University of East Anglia are no longer allowed to throw their mortarboards in the air when they graduate - but they can mime throwing them and pay £8 to have them photoshopped in afterwards.
Tweeted to us by Chris Emerson, from The Independent