I've driven about 32 hours in the past two days from Los Angeles, California to Nashville, Tennessee. You spend that much time behind the wheel and you start noticing little peculiarities that not everybody picks up on. For example, last night I noticed how often semi trucks flash their lights. I made a mental note to look into it a bit further once at home and in front of my computer. Apparently, semis flash their lights for several reasons: To warn of a speed trap, to say "thank you", to let other drivers know they've got room to pass or to alert of an obstacle up ahead. I find it to be an interesting metaphor for all the unspoken communication we share with strangers on a daily basis: the smiles, the nods, the waves, the stares, the winks and the looks all mean something. If you take the time to really notice, we're constantly talking to one another without actually talking to another.