Dear Matthew Alice: Say I trap a fly in my car when I go down the highway doing 65 mph. Why doesn’t the fly get smashed against the back window, assuming flies can’t fly 65 mph? — Tadd Whitmore III, San Diego

That slapping sound you hear is every high school physics teacher in the county whapping palm to forehead. When they taught you this stuff, nobody cared. Now that you’re out of school, it’s a burning mystery. Youth, and education, is wasted on the young. Anyway, the Taddmobile is not only transporting Tadd, that litter of sun-warped tapes, burger wrappers, old lottery tickets, and Big Gulp cups, it’s also carrying along many cubic feet of air and our friend the fly. If the air inside your car were blowing at 65 miles an hour, among other things, your dog wouldn’t have to stick its head out the window to reach that mysterious state of canine bliss a dog achieves when bugs blow up his nose.