Rick Smolan

A lot of people don't want to know, but I'd like to know if I have a 10 percent or a 90 percent chance of developing Alzheimer's some day. If I know I'm likely to develop it, I'm certainly going to start looking around right now to find if there is something that I can do to offset it.

I doubt very much that the chief executives of any of the Fortune 500 corporations can name five edible plants, five native grasses, or five migratory birds within walking distance of their homes, or name the soil series upon which their house sits. And I would contend that if you don't know where you are, you are in fact nowhere at all.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.