When I was a kid, my dad often took us for family drives on Sundays. Whenever we passed a farm with cows in the field, my dad would say, “Quick, voyager, how many cows are there,” then, he’d hit the gas and go fast, too fast for me to count them all before they were out of sight. I’d throw out a good guesstimate like 26 or 34 or 101, but no matter what my answer was, Dad always said, “Nope, there were 28 or 35 or 105.” Then he’d wait for me to say, “how did you do that so quick.’
“Easy, he’d say. I counted the legs and divided by 4.”













