My 1.5 year-old knows how to use the mouse (he grasps the interaction between what's in his hand and what happens on screen), spinning the wheel while the mouse

My 1.5 year-old knows how to use the mouse (he grasps the interaction between what's in his hand and what happens on screen), spinning the wheel while the mouse is over a window makes that window move up and down, and that the "media" button on my keyboard launches Foobar 2000. Kids are wicked smart, and learn shockingly fast. Needless to say, it's impossible to work with him in my lap.