Urban green space, such as parks, woods, streams, green rooftops, and community gardens, provides critical ecosystem services. We take a look at the advantages and challenges of urban green space for public health, urban planning, and the environment (02:53). / Disney's "Little Mermaid" drives a new wave of mermaid diving (27:58). / Elon Musk's Neuralink says it has US FDA approval for human trials. How far are we from brain-computer interface becoming a reality (43:21)? On the show: Heyang, Li Yi & Josh Cotterill