Since the onset of the pandemic, we exist in a constant state of calculation, trying to define our own personal bubble. We’ve all been given a simple rule: maintain six feet of distance between yourself and others. But why six? Producer Sarah Qari uncovers the answer, and talks to some scientists who now say six might not be the right number after all.  This episode was reported and produced by Sarah Qari and Pat Walters. Support Radiolab today at Radiolab.org/donate.