Michael Crichton

Human beings never think for themselves; they find it too uncomfortable. For the most part, members of our species simply repeat what they are told - and become upset if they are exposed to any different view.

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.

Nonetheless, to the extent that terrorists have come into our country or suspected or known terrorists have entered our country across a border, it's been across the Canadian border. There are real issues there.