Anytown, like many towns, has a bus transportation system which purports to take people from a certain point, let us call it "A," to another place entirely, which we shall designate as "B." They use brutal diesel engines to accomplish this, which produce clouds of toxic gas and smoke that can fairly coat the unsuspecting. You can stand on the curb and watch as a thick brown soot issues from the exhaust pipe of one of these beasts. The wind blows it slightly away from you, and you can think "Phew, at least I'm not sucking that directly into my breathing organs." But it's a lie, and you know it. That cloud will do it's level best to kill you, although it is far too weak to cause permanent damage. It's reach extends far into the future.
The purchase of a mobile phone has greatly enhanced my availability, but if there's anyone out there who thinks I need to be more available for, I dunno, stuff, I'm not sure I know them. I like things to be portable; Pallas, my digital brain extension, my telecom gear, even my external speakers are battery powered and lightweight. Does this mean I'm afraid to put down roots for some reason? I'll have to ponder that one.