You are a pediatrician working in a busy urban clinic in the Northeast. It is late February, and the winter has been exceptionally long, grey, and biting.

Glancing out the window, you watch the morning rush hour struggle against the elements. The sidewalk was a sheet of black ice, forcing an entire block of suits and briefcases to adopt a survival stance: tiny, shuffling steps, arms flailed out for balance, waddling side-to-side. It looked like a flash mob of penguins in business casual.