This week on Lost in Science: Did you know the Andromeda galaxy is heading straight for us? Chris unpacks new research that pushes the expected Milky Way-Andromeda collision a few billion years further into the future. Meanwhile, Stu investigates cannonball fungi—tiny but mighty organisms that launch their spores over six metres! Find out how these fungal sharpshooters can stain your house and frustrate gardeners everywhere.