The Difference Between the Sexes - Part One

In the park today, Son's wobbly bottom tooth fell out while kicking his football.
"OMG, OMG! " Daughter cried, distraught at the very idea that her brother's tooth was now lost somewhere in the vast undergrowth and he wouldn't be able to leave it under his pillow for collection by the tooth fairy.
Much drama (plus much enforced scrabbling in undergrowth) ensued as Son looked on, nonplussed.
"If we don't find the tooth will I still get the money?" he asked.
"Yes, I should think so," I replied, picking through rotting leaves and broken twigs, hoping that wet pile of mud I just poked wasn't dog poop.
"OK," he shrugged. "Let's go."
Then he galloped away, kicking his football passionately and leaving his poor orphaned baby tooth behind without a second's thought.
Daughter fretted the whole way home in the car about the implications of all this. Would the tooth fairy find the tooth in the park? What if a hungry dog found it first? Should we write a note to someone and explain? Had this ever happened anyone ever before, in the history of the world?
Son meanwhile looked out the window, totally disinterested in all the female angst.
"Can I buy a new football with the money?" he asked.