John Lloyd and his curator Lee Mack are joined by comedian Karen Dunbar, metallurgist Professor John Wood and breakfast radio host Shaun Keaveny.

Professor of Ignorance John Lloyd and his curator Lee Mack welcome comedian and writer Karen Dunbar, metallurgist Professor John Wood and breakfast radio host Shaun Keaveny.

This week, the Museum's Guest Committee steel themselves for some deadly karaoke, use a massive machine to show off a single atom of iron and experience the unalloyed joy of opening an old-fashioned tube of toothpaste.

The show was researched by Mike Turner and Emily Jupitus of QI.

The Producers were Richard Turner and Anne Miller.

A BBC Studios Production.