Once we get used to seeing something out in the world, it becomes surprisingly easy to take it for granted.
For instance, it's entirely possible to see the people who deliver our mail and collect our garbage regularly without realizing what they might experience on a given work day. And that isn't just limited to humans, either.
By now, most of us are familiar with the concept of service dogs, particularly those who work to assist blind people as they go about their lives. But while we may notice how disciplined and focused they are, we can still learn a lot about how they became that way.
But now, there's a documentary on Netflix that not only takes us into the world of guide dog training, but the selection process.