Jo's special guest in episode 105 is Dr Simon Morden, a science fiction writer and planetary geologist who also talks about his first non-fiction book 'The Red Planet: A Natural History of Mars'. Plus he answers Jo's Quick Six.

Science communicator & public engagement trainer Dr Jamie Gallagher is back with another story from the Periodic Table - two related elements that played their part in history.

Presented, produced & edited by Jo Durrant.

Music licensed from Purple Planet.