Get ready for the beautiful sound of some German language: an unwell Julian Meding starts this 49th Second-Hand Book Factory by introducing Charles Adrian to the science of strolling (Spaziergangswissenschaft). They also talk about the politics of threesomes and Julian brings both great music and deathless critical thinking. Apologies for the electronic intrusions - Julian wasn't asked to turn off his phone, which is Charles Adrian's fault. [Warning: some swearing]