Podcast:99% Invisible Published On: Wed Apr 27 2016 Description: Humans form cities from concrete, metal, and glass, designing structures and infrastructure primarily to serve a single bipedal species. Walking down a familiar city street, it is easy to overlook squirrels climbing in trees, weeds growing up through cracks in … Continue reading → Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to ad-free new episodes and get exclusive access to bonus content.