Two PhD students in the School of Chemistry occasionally join forces as The Chemical Sisters - playing music on modified test tubes.

They essentially did it once for a laugh, and the poor ladies have since been roped into doing it twice more for films we've made for the Periodic Table of Videos.

Here they're playing Happy Birthday for a film celebrating the first year of the PTOV.

A few short clips were used in the main films, but here I've posted all the uncut footage just so you can see the women in action.