A nasal spray for flu, and is this how life began on Earth?

This week, we discuss a new antibody-based nasal spray that protects against the flu: how does it work? Plus, the tiny self-replicating molecule that may give clues to the origins of life on Earth, whether we should regulate "mirror life" research, and how bacteria protect oak trees from drought and other stresses... Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)