Joe and Fergus chat about all things mercury and find that there's much more to it than just thermometers! It's been used since ancient times - some thought it was the key to eternal life, despite its poisonous nature. Find out more in this week's episode.

We've got a double whammy for you this week! Fluorine and Chlorine are elemental cousins. They're both halogens, highly reactive elements that sit in the penultimate column of the periodic table. In this episode, we talk about why fluorine is added to water and chlorine's deadly use as a...