Is a tough new law in Germany aimed at blocking hate speech in danger of limiting free speech? We hear how comedians are having their jokes taken down in a “culture of deletion”. The World Health Organisation says 95% of people in cities breathe unsafe air, but what is meant by 'unsafe'? Plus, Mount Etna in Italy has reportedly moved by 14mm, but who is doing the measuring and how can it be accurate? We all fantasise – the dream home, a fulfilling job, our perfect partner. But some people go further, inventing and inhabiting elaborate fantasy worlds. Nicola Kelly finds out why, spending time with cosplayers, delving into virtual worlds and visiting the nightclub where people dress up as unicorns. Photo Caption: German comedian Sophie Passmann was one of the first people to be caught up in the country’s new hate speech law when one of her jokes on Twitter was deleted Photo Credit: BBC