Great great grandparents

So my mother just came back from Japan, and brought back two copies of these old photographs. I honestly don't know all that much about my family history. I'm sure I could find out more if I asked around, but I've never gotten around to it. Anyways, this is the first time I've seen my great great grandparents. This is just really fascinating on so many levels. It's really cool to see my ancestors from way back in the day. And it's also really cool to know that these photos must have originally been taken around 100 years ago. I recently watched this documentary about the history of the camera, and this just ties in really well.
It's easy to forget how photography started as a science, not an art form.