Stanistani writes: "According to Newsweek, at US airports some security personnel will be observing passengers for facial expressions which indicate malicious intent. If they believe you look like you might be thinking of causing harm, you can be taken aside for further questioning. Welcome these new overseers: 'Behavior Detection Officers.' Their potentially life-changing decisions will be based on the pseudoscience of 'micro-expressions.'" Link to Original Source
I've never been canoeing before, but I imagine there must be just a few
simple heuristics you have to remember...
Yes, don't fall out, and don't hit rocks.