Babies

Could someone explain to me why babies make people smile? There is a gentleman who works at my office. He is the surliest, most sour-looking person I have ever met. Far more surly than I am -- and that's saying something. He is not just serious or even dour -- he wears a permanent grimace of haughty disgust that by now has probably etched itself into the tissue of his face like botched plastic surgery. Until today. When another co-worker's wife stopped by the office with her one-year-old twins, the man smiled. I could not believe it -- I did not think it was possible. Am I a freak of nature for taking a groundhog or even a squirrel over a baby for cuteness any day?